diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6acb3241c4..553beee6b6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,7 +22,7 @@ jobs:
         node-version:
           - 18
           - 20
-          - 22
+          - 22.17.1 # experimental TS type striping in 22.18.0 breaks the build
 
     services:
       redis:
diff --git a/docs/engine.io-protocol/v4-test-suite/test-suite.js b/docs/engine.io-protocol/v4-test-suite/test-suite.js
index 70b28f5fe8..b010f50967 100644
--- a/docs/engine.io-protocol/v4-test-suite/test-suite.js
+++ b/docs/engine.io-protocol/v4-test-suite/test-suite.js
@@ -17,16 +17,35 @@ function sleep(delay) {
   return new Promise((resolve) => setTimeout(resolve, delay));
 }
 
+function createWebSocket(url) {
+  const socket = new WebSocket(url);
+  socket._eventBuffer = {};
+  socket._pendingPromises = {};
+
+  for (const eventType of ["open", "close", "message"]) {
+    socket._eventBuffer[eventType] = [];
+    socket._pendingPromises[eventType] = [];
+
+    socket.addEventListener(eventType, (event) => {
+      if (socket._pendingPromises[eventType].length) {
+        socket._pendingPromises[eventType].shift()(event);
+      } else {
+        socket._eventBuffer[eventType].push(event);
+      }
+    });
+  }
+
+  return socket;
+}
+
 function waitFor(socket, eventType) {
-  return new Promise((resolve) => {
-    socket.addEventListener(
-      eventType,
-      (event) => {
-        resolve(event);
-      },
-      { once: true }
-    );
-  });
+  if (socket._eventBuffer[eventType].length) {
+    return Promise.resolve(socket._eventBuffer[eventType].shift());
+  } else {
+    return new Promise((resolve) => {
+      socket._pendingPromises[eventType].push(resolve);
+    });
+  }
 }
 
 async function initLongPollingSession() {
@@ -110,7 +129,7 @@ describe("Engine.IO protocol", () => {
 
     describe("WebSocket", () => {
       it("successfully opens a session", async () => {
-        const socket = new WebSocket(
+        const socket = createWebSocket(
           `${WS_URL}/engine.io/?EIO=4&transport=websocket`
         );
 
@@ -137,7 +156,7 @@ describe("Engine.IO protocol", () => {
       });
 
       it("fails with an invalid 'EIO' query parameter", async () => {
-        const socket = new WebSocket(
+        const socket = createWebSocket(
           `${WS_URL}/engine.io/?transport=websocket`
         );
 
@@ -145,9 +164,9 @@ describe("Engine.IO protocol", () => {
           socket.on("error", () => {});
         }
 
-        waitFor(socket, "close");
+        await waitFor(socket, "close");
 
-        const socket2 = new WebSocket(
+        const socket2 = createWebSocket(
           `${WS_URL}/engine.io/?EIO=abc&transport=websocket`
         );
 
@@ -155,19 +174,19 @@ describe("Engine.IO protocol", () => {
           socket2.on("error", () => {});
         }
 
-        waitFor(socket2, "close");
+        await waitFor(socket2, "close");
       });
 
       it("fails with an invalid 'transport' query parameter", async () => {
-        const socket = new WebSocket(`${WS_URL}/engine.io/?EIO=4`);
+        const socket = createWebSocket(`${WS_URL}/engine.io/?EIO=4`);
 
         if (isNodejs) {
           socket.on("error", () => {});
         }
 
-        waitFor(socket, "close");
+        await waitFor(socket, "close");
 
-        const socket2 = new WebSocket(
+        const socket2 = createWebSocket(
           `${WS_URL}/engine.io/?EIO=4&transport=abc`
         );
 
@@ -175,7 +194,7 @@ describe("Engine.IO protocol", () => {
           socket2.on("error", () => {});
         }
 
-        waitFor(socket2, "close");
+        await waitFor(socket2, "close");
       });
     });
   });
@@ -317,7 +336,7 @@ describe("Engine.IO protocol", () => {
 
     describe("WebSocket", () => {
       it("sends and receives a plain text packet", async () => {
-        const socket = new WebSocket(
+        const socket = createWebSocket(
           `${WS_URL}/engine.io/?EIO=4&transport=websocket`
         );
 
@@ -335,7 +354,7 @@ describe("Engine.IO protocol", () => {
       });
 
       it("sends and receives a binary packet", async () => {
-        const socket = new WebSocket(
+        const socket = createWebSocket(
           `${WS_URL}/engine.io/?EIO=4&transport=websocket`
         );
         socket.binaryType = "arraybuffer";
@@ -352,7 +371,7 @@ describe("Engine.IO protocol", () => {
       });
 
       it("closes the session upon invalid packet format", async () => {
-        const socket = new WebSocket(
+        const socket = createWebSocket(
           `${WS_URL}/engine.io/?EIO=4&transport=websocket`
         );
 
@@ -412,7 +431,7 @@ describe("Engine.IO protocol", () => {
 
     describe("WebSocket", () => {
       it("sends ping/pong packets", async () => {
-        const socket = new WebSocket(
+        const socket = createWebSocket(
           `${WS_URL}/engine.io/?EIO=4&transport=websocket`
         );
 
@@ -430,7 +449,7 @@ describe("Engine.IO protocol", () => {
       });
 
       it("closes the session upon ping timeout", async () => {
-        const socket = new WebSocket(
+        const socket = createWebSocket(
           `${WS_URL}/engine.io/?EIO=4&transport=websocket`
         );
 
@@ -468,7 +487,7 @@ describe("Engine.IO protocol", () => {
 
     describe("WebSocket", () => {
       it("forcefully closes the session", async () => {
-        const socket = new WebSocket(
+        const socket = createWebSocket(
           `${WS_URL}/engine.io/?EIO=4&transport=websocket`
         );
 
@@ -485,7 +504,7 @@ describe("Engine.IO protocol", () => {
     it("successfully upgrades from HTTP long-polling to WebSocket", async () => {
       const sid = await initLongPollingSession();
 
-      const socket = new WebSocket(
+      const socket = createWebSocket(
         `${WS_URL}/engine.io/?EIO=4&transport=websocket&sid=${sid}`
       );
 
@@ -521,12 +540,13 @@ describe("Engine.IO protocol", () => {
     it("ignores HTTP requests with same sid after upgrade", async () => {
       const sid = await initLongPollingSession();
 
-      const socket = new WebSocket(
+      const socket = createWebSocket(
         `${WS_URL}/engine.io/?EIO=4&transport=websocket&sid=${sid}`
       );
 
       await waitFor(socket, "open");
       socket.send("2probe");
+      await waitFor(socket, "message"); // "3probe"
       socket.send("5");
 
       const pollResponse = await fetch(
@@ -545,15 +565,16 @@ describe("Engine.IO protocol", () => {
     it("ignores WebSocket connection with same sid after upgrade", async () => {
       const sid = await initLongPollingSession();
 
-      const socket = new WebSocket(
+      const socket = createWebSocket(
         `${WS_URL}/engine.io/?EIO=4&transport=websocket&sid=${sid}`
       );
 
       await waitFor(socket, "open");
       socket.send("2probe");
+      await waitFor(socket, "message"); // "3probe"
       socket.send("5");
 
-      const socket2 = new WebSocket(
+      const socket2 = createWebSocket(
         `${WS_URL}/engine.io/?EIO=4&transport=websocket&sid=${sid}`
       );
 
diff --git a/docs/socket.io-protocol/v5-test-suite/test-suite.js b/docs/socket.io-protocol/v5-test-suite/test-suite.js
index aaee882e0d..a00e433ddb 100644
--- a/docs/socket.io-protocol/v5-test-suite/test-suite.js
+++ b/docs/socket.io-protocol/v5-test-suite/test-suite.js
@@ -17,16 +17,35 @@ function sleep(delay) {
   return new Promise((resolve) => setTimeout(resolve, delay));
 }
 
+function createWebSocket(url) {
+  const socket = new WebSocket(url);
+  socket._eventBuffer = {};
+  socket._pendingPromises = {};
+
+  for (const eventType of ["open", "close", "message"]) {
+    socket._eventBuffer[eventType] = [];
+    socket._pendingPromises[eventType] = [];
+
+    socket.addEventListener(eventType, (event) => {
+      if (socket._pendingPromises[eventType].length) {
+        socket._pendingPromises[eventType].shift()(event);
+      } else {
+        socket._eventBuffer[eventType].push(event);
+      }
+    });
+  }
+
+  return socket;
+}
+
 function waitFor(socket, eventType) {
-  return new Promise((resolve) => {
-    socket.addEventListener(
-      eventType,
-      (event) => {
-        resolve(event);
-      },
-      { once: true }
-    );
-  });
+  if (socket._eventBuffer[eventType].length) {
+    return Promise.resolve(socket._eventBuffer[eventType].shift());
+  } else {
+    return new Promise((resolve) => {
+      socket._pendingPromises[eventType].push(resolve);
+    });
+  }
 }
 
 function waitForPackets(socket, count) {
@@ -55,7 +74,7 @@ async function initLongPollingSession() {
 }
 
 async function initSocketIOConnection() {
-  const socket = new WebSocket(
+  const socket = createWebSocket(
     `${WS_URL}/socket.io/?EIO=4&transport=websocket`
   );
   socket.binaryType = "arraybuffer";
@@ -145,7 +164,7 @@ describe("Engine.IO protocol", () => {
 
     describe("WebSocket", () => {
       it("should successfully open a session", async () => {
-        const socket = new WebSocket(
+        const socket = createWebSocket(
           `${WS_URL}/socket.io/?EIO=4&transport=websocket`
         );
 
@@ -172,7 +191,7 @@ describe("Engine.IO protocol", () => {
       });
 
       it("should fail with an invalid 'EIO' query parameter", async () => {
-        const socket = new WebSocket(
+        const socket = createWebSocket(
           `${WS_URL}/socket.io/?transport=websocket`
         );
 
@@ -180,9 +199,9 @@ describe("Engine.IO protocol", () => {
           socket.on("error", () => {});
         }
 
-        waitFor(socket, "close");
+        await waitFor(socket, "close");
 
-        const socket2 = new WebSocket(
+        const socket2 = createWebSocket(
           `${WS_URL}/socket.io/?EIO=abc&transport=websocket`
         );
 
@@ -190,19 +209,19 @@ describe("Engine.IO protocol", () => {
           socket2.on("error", () => {});
         }
 
-        waitFor(socket2, "close");
+        await waitFor(socket2, "close");
       });
 
       it("should fail with an invalid 'transport' query parameter", async () => {
-        const socket = new WebSocket(`${WS_URL}/socket.io/?EIO=4`);
+        const socket = createWebSocket(`${WS_URL}/socket.io/?EIO=4`);
 
         if (isNodejs) {
           socket.on("error", () => {});
         }
 
-        waitFor(socket, "close");
+        await waitFor(socket, "close");
 
-        const socket2 = new WebSocket(
+        const socket2 = createWebSocket(
           `${WS_URL}/socket.io/?EIO=4&transport=abc`
         );
 
@@ -210,7 +229,7 @@ describe("Engine.IO protocol", () => {
           socket2.on("error", () => {});
         }
 
-        waitFor(socket2, "close");
+        await waitFor(socket2, "close");
       });
     });
   });
@@ -260,7 +279,7 @@ describe("Engine.IO protocol", () => {
 
     describe("WebSocket", () => {
       it("should send ping/pong packets", async () => {
-        const socket = new WebSocket(
+        const socket = createWebSocket(
           `${WS_URL}/socket.io/?EIO=4&transport=websocket`
         );
 
@@ -278,7 +297,7 @@ describe("Engine.IO protocol", () => {
       });
 
       it("should close the session upon ping timeout", async () => {
-        const socket = new WebSocket(
+        const socket = createWebSocket(
           `${WS_URL}/socket.io/?EIO=4&transport=websocket`
         );
 
@@ -316,7 +335,7 @@ describe("Engine.IO protocol", () => {
 
     describe("WebSocket", () => {
       it("should forcefully close the session", async () => {
-        const socket = new WebSocket(
+        const socket = createWebSocket(
           `${WS_URL}/socket.io/?EIO=4&transport=websocket`
         );
 
@@ -333,7 +352,7 @@ describe("Engine.IO protocol", () => {
     it("should successfully upgrade from HTTP long-polling to WebSocket", async () => {
       const sid = await initLongPollingSession();
 
-      const socket = new WebSocket(
+      const socket = createWebSocket(
         `${WS_URL}/socket.io/?EIO=4&transport=websocket&sid=${sid}`
       );
 
@@ -353,12 +372,13 @@ describe("Engine.IO protocol", () => {
     it("should ignore HTTP requests with same sid after upgrade", async () => {
       const sid = await initLongPollingSession();
 
-      const socket = new WebSocket(
+      const socket = createWebSocket(
         `${WS_URL}/socket.io/?EIO=4&transport=websocket&sid=${sid}`
       );
 
       await waitFor(socket, "open");
       socket.send("2probe");
+      await waitFor(socket, "message"); // "3probe"
       socket.send("5");
 
       const pollResponse = await fetch(
@@ -371,15 +391,16 @@ describe("Engine.IO protocol", () => {
     it("should ignore WebSocket connection with same sid after upgrade", async () => {
       const sid = await initLongPollingSession();
 
-      const socket = new WebSocket(
+      const socket = createWebSocket(
         `${WS_URL}/socket.io/?EIO=4&transport=websocket&sid=${sid}`
       );
 
       await waitFor(socket, "open");
       socket.send("2probe");
+      await waitFor(socket, "message"); // "3probe"
       socket.send("5");
 
-      const socket2 = new WebSocket(
+      const socket2 = createWebSocket(
         `${WS_URL}/socket.io/?EIO=4&transport=websocket&sid=${sid}`
       );
 
@@ -391,7 +412,7 @@ describe("Engine.IO protocol", () => {
 describe("Socket.IO protocol", () => {
   describe("connect", () => {
     it("should allow connection to the main namespace", async () => {
-      const socket = new WebSocket(
+      const socket = createWebSocket(
         `${WS_URL}/socket.io/?EIO=4&transport=websocket`
       );
 
@@ -414,7 +435,7 @@ describe("Socket.IO protocol", () => {
     });
 
     it("should allow connection to the main namespace with a payload", async () => {
-      const socket = new WebSocket(
+      const socket = createWebSocket(
         `${WS_URL}/socket.io/?EIO=4&transport=websocket`
       );
 
@@ -437,7 +458,7 @@ describe("Socket.IO protocol", () => {
     });
 
     it("should allow connection to a custom namespace", async () => {
-      const socket = new WebSocket(
+      const socket = createWebSocket(
         `${WS_URL}/socket.io/?EIO=4&transport=websocket`
       );
 
@@ -460,7 +481,7 @@ describe("Socket.IO protocol", () => {
     });
 
     it("should allow connection to a custom namespace with a payload", async () => {
-      const socket = new WebSocket(
+      const socket = createWebSocket(
         `${WS_URL}/socket.io/?EIO=4&transport=websocket`
       );
 
@@ -483,7 +504,7 @@ describe("Socket.IO protocol", () => {
     });
 
     it("should disallow connection to an unknown namespace", async () => {
-      const socket = new WebSocket(
+      const socket = createWebSocket(
         `${WS_URL}/socket.io/?EIO=4&transport=websocket`
       );
 
@@ -497,7 +518,7 @@ describe("Socket.IO protocol", () => {
     });
 
     it("should disallow connection with an invalid handshake", async () => {
-      const socket = new WebSocket(
+      const socket = createWebSocket(
         `${WS_URL}/socket.io/?EIO=4&transport=websocket`
       );
 
@@ -508,10 +529,9 @@ describe("Socket.IO protocol", () => {
       await waitFor(socket, "close");
     });
 
-    
     it("should close the connection if no handshake is received", async () => {
-      const socket = new WebSocket(
-          `${WS_URL}/socket.io/?EIO=4&transport=websocket`
+      const socket = createWebSocket(
+        `${WS_URL}/socket.io/?EIO=4&transport=websocket`
       );
 
       await waitFor(socket, "close");
diff --git a/package-lock.json b/package-lock.json
index f0b8ca918d..33b83d3ba7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -42,6 +42,7 @@
         "base64-arraybuffer": "^1.0.2",
         "benchmark": "^2.1.4",
         "blob": "^0.1.0",
+        "cookie": "~0.7.2",
         "eiows": "^7.1.0",
         "engine.io-client-v3": "npm:engine.io-client@^3.5.2",
         "expect.js": "^0.3.1",
@@ -2823,11 +2824,6 @@
         "@types/responselike": "^1.0.0"
       }
     },
-    "node_modules/@types/cookie": {
-      "version": "0.4.1",
-      "resolved": "https://registry.npmjs.org/@types/cookie/-/cookie-0.4.1.tgz",
-      "integrity": "sha512-XW/Aa8APYr6jSVVA1y/DEIZX0/GMKLEVekNG727R8cs56ahETkRAy/3DR7+fJyh7oUgGwNQaRfXCun0+KbWY7Q=="
-    },
     "node_modules/@types/cors": {
       "version": "2.8.17",
       "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.17.tgz",
@@ -15511,10 +15507,9 @@
       }
     },
     "packages/engine.io": {
-      "version": "6.6.2",
+      "version": "6.6.3",
       "license": "MIT",
       "dependencies": {
-        "@types/cookie": "^0.4.1",
         "@types/cors": "^2.8.12",
         "@types/node": ">=10.0.0",
         "accepts": "~1.3.4",
@@ -15530,7 +15525,7 @@
       }
     },
     "packages/engine.io-client": {
-      "version": "6.6.1",
+      "version": "6.6.3",
       "license": "MIT",
       "dependencies": {
         "@socket.io/component-emitter": "~3.1.0",
@@ -15572,7 +15567,7 @@
       }
     },
     "packages/socket.io": {
-      "version": "4.8.0",
+      "version": "4.8.1",
       "license": "MIT",
       "dependencies": {
         "accepts": "~1.3.4",
@@ -15596,7 +15591,7 @@
       }
     },
     "packages/socket.io-client": {
-      "version": "4.8.0",
+      "version": "4.8.1",
       "license": "MIT",
       "dependencies": {
         "@socket.io/component-emitter": "~3.1.0",
diff --git a/package.json b/package.json
index 1c249dbcf2..f6b3a04419 100644
--- a/package.json
+++ b/package.json
@@ -43,6 +43,7 @@
     "base64-arraybuffer": "^1.0.2",
     "benchmark": "^2.1.4",
     "blob": "^0.1.0",
+    "cookie": "~0.7.2",
     "eiows": "^7.1.0",
     "engine.io-client-v3": "npm:engine.io-client@^3.5.2",
     "expect.js": "^0.3.1",
diff --git a/packages/engine.io-client/CHANGELOG.md b/packages/engine.io-client/CHANGELOG.md
index 2a090dcb18..3553b84b62 100644
--- a/packages/engine.io-client/CHANGELOG.md
+++ b/packages/engine.io-client/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 | Version                                                                                                     | Release date   | Bundle size (UMD min+gzip) |
 |-------------------------------------------------------------------------------------------------------------|----------------|----------------------------|
+| [6.6.3](#663-2025-01-23)                                                                                    | January 2025   | `8.7 KB`                   |
 | [6.6.2](#662-2024-10-23)                                                                                    | October 2024   | `8.7 KB`                   |
 | [6.6.1](#661-2024-09-21)                                                                                    | September 2024 | `8.7 KB`                   |
 | [6.6.0](#660-2024-06-21)                                                                                    | June 2024      | `8.6 KB`                   |
@@ -40,6 +41,20 @@
 
 # Release notes
 
+## [6.6.3](https://github.com/socketio/socket.io/compare/engine.io-client@6.6.2...engine.io-client@6.6.3) (2025-01-23)
+
+
+### Bug Fixes
+
+* correctly consume the `ws` package ([#5220](https://github.com/socketio/socket.io/issues/5220)) ([7fcddcb](https://github.com/socketio/socket.io/commit/7fcddcb3bbd236b46aa8fee6f4ce6c45afb7b03a))
+
+
+### Dependencies
+
+- [`ws@~8.17.1`](https://github.com/websockets/ws/releases/tag/8.17.1) (no change)
+
+
+
 ## [6.6.2](https://github.com/socketio/socket.io/compare/engine.io-client@6.6.1...engine.io-client@6.6.2) (2024-10-23)
 
 
diff --git a/packages/engine.io-client/dist/engine.io.esm.min.js b/packages/engine.io-client/dist/engine.io.esm.min.js
index a37741a87e..4dc071a834 100644
--- a/packages/engine.io-client/dist/engine.io.esm.min.js
+++ b/packages/engine.io-client/dist/engine.io.esm.min.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v6.6.2
- * (c) 2014-2024 Guillermo Rauch
+ * Engine.IO v6.6.3
+ * (c) 2014-2025 Guillermo Rauch
  * Released under the MIT License.
  */
 const t=Object.create(null);t.open="0",t.close="1",t.ping="2",t.pong="3",t.message="4",t.upgrade="5",t.noop="6";const s=Object.create(null);Object.keys(t).forEach((e=>{s[t[e]]=e}));const e={type:"error",data:"parser error"},i="function"==typeof Blob||"undefined"!=typeof Blob&&"[object BlobConstructor]"===Object.prototype.toString.call(Blob),n="function"==typeof ArrayBuffer,r=t=>"function"==typeof ArrayBuffer.isView?ArrayBuffer.isView(t):t&&t.buffer instanceof ArrayBuffer,o=({type:s,data:e},o,c)=>i&&e instanceof Blob?o?c(e):h(e,c):n&&(e instanceof ArrayBuffer||r(e))?o?c(e):h(new Blob([e]),c):c(t[s]+(e||"")),h=(t,s)=>{const e=new FileReader;return e.onload=function(){const t=e.result.split(",")[1];s("b"+(t||""))},e.readAsDataURL(t)};function c(t){return t instanceof Uint8Array?t:t instanceof ArrayBuffer?new Uint8Array(t):new Uint8Array(t.buffer,t.byteOffset,t.byteLength)}let a;const u="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",f="undefined"==typeof 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diff --git a/packages/engine.io-client/dist/engine.io.js b/packages/engine.io-client/dist/engine.io.js
index cb2100204f..83d420513f 100644
--- a/packages/engine.io-client/dist/engine.io.js
+++ b/packages/engine.io-client/dist/engine.io.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v6.6.2
- * (c) 2014-2024 Guillermo Rauch
+ * Engine.IO v6.6.3
+ * (c) 2014-2025 Guillermo Rauch
  * Released under the MIT License.
  */
 (function (global, factory) {
diff --git a/packages/engine.io-client/dist/engine.io.min.js b/packages/engine.io-client/dist/engine.io.min.js
index 76a48e1c67..782d498eee 100644
--- a/packages/engine.io-client/dist/engine.io.min.js
+++ b/packages/engine.io-client/dist/engine.io.min.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v6.6.2
- * (c) 2014-2024 Guillermo Rauch
+ * Engine.IO v6.6.3
+ * (c) 2014-2025 Guillermo Rauch
  * Released under the MIT License.
  */
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t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};return i(t,{xd:this.xd},this.opts),new J(Z,this.uri(),t)},n}(G);function Z(t){var n=t.xdomain;try{if("undefined"!=typeof XMLHttpRequest&&(!n||F))return new XMLHttpRequest}catch(t){}if(!n)try{return new(R[["Active"].concat("Object").join("X")])("Microsoft.XMLHTTP")}catch(t){}}var _="undefined"!=typeof navigator&&"string"==typeof navigator.product&&"reactnative"===navigator.product.toLowerCase(),tt=function(t){function i(){return t.apply(this,arguments)||this}e(i,t);var r=i.prototype;return r.doOpen=function(){var t=this.uri(),n=this.opts.protocols,i=_?{}:D(this.opts,"agent","perMessageDeflate","pfx","key","passphrase","cert","ca","ciphers","rejectUnauthorized","localAddress","protocolVersion","origin","maxPayload","family","checkServerIdentity");this.opts.extraHeaders&&(i.headers=this.opts.extraHeaders);try{this.ws=this.createSocket(t,n,i)}catch(t){return this.emitReserved("error",t)}this.ws.binaryType=this.socket.binaryType,this.addEventListeners()},r.addEventListeners=function(){var t=this;this.ws.onopen=function(){t.opts.autoUnref&&t.ws.S.unref(),t.onOpen()},this.ws.onclose=function(n){return t.onClose({description:"websocket connection closed",context:n})},this.ws.onmessage=function(n){return t.onData(n.data)},this.ws.onerror=function(n){return t.onError("websocket error",n)}},r.write=function(t){var n=this;this.writable=!1;for(var i=function(){var i=t[r],e=r===t.length-1;b(i,n.supportsBinary,(function(t){try{n.doWrite(i,t)}catch(t){}e&&L((function(){n.writable=!0,n.emitReserved("drain")}),n.setTimeoutFn)}))},r=0;r<t.length;r++)i()},r.doClose=function(){void 0!==this.ws&&(this.ws.onerror=function(){},this.ws.close(),this.ws=null)},r.uri=function(){var t=this.opts.secure?"wss":"ws",n=this.query||{};return this.opts.timestampRequests&&(n[this.opts.timestampParam]=q()),this.supportsBinary||(n.b64=1),this.createUri(t,n)},n(i,[{key:"name",get:function(){return"websocket"}}])}(V),nt=R.WebSocket||R.MozWebSocket,it=function(t){function n(){return t.apply(this,arguments)||this}e(n,t);var i=n.prototype;return i.createSocket=function(t,n,i){return _?new nt(t,n,i):n?new nt(t,n):new nt(t)},i.doWrite=function(t,n){this.ws.send(n)},n}(tt),rt=function(t){function i(){return t.apply(this,arguments)||this}e(i,t);var r=i.prototype;return r.doOpen=function(){var t=this;try{this.M=new WebTransport(this.createUri("https"),this.opts.transportOptions[this.name])}catch(t){return this.emitReserved("error",t)}this.M.closed.then((function(){t.onClose()})).catch((function(n){t.onError("webtransport error",n)})),this.M.ready.then((function(){t.M.createBidirectionalStream().then((function(n){var i=function(t,n){j||(j=new TextDecoder);var i=[],r=0,e=-1,o=!1;return new TransformStream({transform:function(s,u){for(i.push(s);;){if(0===r){if(M(i)<1)break;var f=x(i,1);o=!(128&~f[0]),e=127&f[0],r=e<126?3:126===e?1:2}else if(1===r){if(M(i)<2)break;var h=x(i,2);e=new DataView(h.buffer,h.byteOffset,h.length).getUint16(0),r=3}else if(2===r){if(M(i)<8)break;var c=x(i,8),a=new DataView(c.buffer,c.byteOffset,c.length),p=a.getUint32(0);if(p>Math.pow(2,21)-1){u.enqueue(l);break}e=p*Math.pow(2,32)+a.getUint32(4),r=3}else{if(M(i)<e)break;var v=x(i,e);u.enqueue(E(o?v:j.decode(v),n)),r=0}if(0===e||e>t){u.enqueue(l);break}}}})}(Number.MAX_SAFE_INTEGER,t.socket.binaryType),r=n.readable.pipeThrough(i).getReader(),e=S();e.readable.pipeTo(n.writable),t.C=e.writable.getWriter();!function n(){r.read().then((function(i){var r=i.done,e=i.value;r||(t.onPacket(e),n())})).catch((function(t){}))}();var o={type:"open"};t.query.sid&&(o.data='{"sid":"'.concat(t.query.sid,'"}')),t.C.write(o).then((function(){return t.onOpen()}))}))}))},r.write=function(t){var n=this;this.writable=!1;for(var i=function(){var i=t[r],e=r===t.length-1;n.C.write(i).then((function(){e&&L((function(){n.writable=!0,n.emitReserved("drain")}),n.setTimeoutFn)}))},r=0;r<t.length;r++)i()},r.doClose=function(){var t;null===(t=this.M)||void 0===t||t.close()},n(i,[{key:"name",get:function(){return"webtransport"}}])}(V),et={websocket:it,webtransport:rt,polling:Y},ot=/^(?:(?![^:@\/?#]+:[^:@\/]*@)(http|https|ws|wss):\/\/)?((?:(([^:@\/?#]*)(?::([^:@\/?#]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/,st=["source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","anchor"];function ut(t){if(t.length>8e3)throw"URI too long";var n=t,i=t.indexOf("["),r=t.indexOf("]");-1!=i&&-1!=r&&(t=t.substring(0,i)+t.substring(i,r).replace(/:/g,";")+t.substring(r,t.length));for(var e,o,s=ot.exec(t||""),u={},f=14;f--;)u[st[f]]=s[f]||"";return-1!=i&&-1!=r&&(u.source=n,u.host=u.host.substring(1,u.host.length-1).replace(/;/g,":"),u.authority=u.authority.replace("[","").replace("]","").replace(/;/g,":"),u.ipv6uri=!0),u.pathNames=function(t,n){var i=/\/{2,9}/g,r=n.replace(i,"/").split("/");"/"!=n.slice(0,1)&&0!==n.length||r.splice(0,1);"/"==n.slice(-1)&&r.splice(r.length-1,1);return r}(0,u.path),u.queryKey=(e=u.query,o={},e.replace(/(?:^|&)([^&=]*)=?([^&]*)/g,(function(t,n,i){n&&(o[n]=i)})),o),u}var ft="function"==typeof addEventListener&&"function"==typeof removeEventListener,ht=[];ft&&addEventListener("offline",(function(){ht.forEach((function(t){return t()}))}),!1);var ct=function(t){function n(n,r){var e;if((e=t.call(this)||this).binaryType="arraybuffer",e.writeBuffer=[],e.L=0,e.R=-1,e.D=-1,e.P=-1,e.I=1/0,n&&"object"===f(n)&&(r=n,n=null),n){var o=ut(n);r.hostname=o.host,r.secure="https"===o.protocol||"wss"===o.protocol,r.port=o.port,o.query&&(r.query=o.query)}else r.host&&(r.hostname=ut(r.host).host);return $(e,r),e.secure=null!=r.secure?r.secure:"undefined"!=typeof location&&"https:"===location.protocol,r.hostname&&!r.port&&(r.port=e.secure?"443":"80"),e.hostname=r.hostname||("undefined"!=typeof location?location.hostname:"localhost"),e.port=r.port||("undefined"!=typeof location&&location.port?location.port:e.secure?"443":"80"),e.transports=[],e.$={},r.transports.forEach((function(t){var n=t.prototype.name;e.transports.push(n),e.$[n]=t})),e.opts=i({path:"/engine.io",agent:!1,withCredentials:!1,upgrade:!0,timestampParam:"t",rememberUpgrade:!1,addTrailingSlash:!0,rejectUnauthorized:!0,perMessageDeflate:{threshold:1024},transportOptions:{},closeOnBeforeunload:!1},r),e.opts.path=e.opts.path.replace(/\/$/,"")+(e.opts.addTrailingSlash?"/":""),"string"==typeof e.opts.query&&(e.opts.query=function(t){for(var n={},i=t.split("&"),r=0,e=i.length;r<e;r++){var o=i[r].split("=");n[decodeURIComponent(o[0])]=decodeURIComponent(o[1])}return n}(e.opts.query)),ft&&(e.opts.closeOnBeforeunload&&(e.q=function(){e.transport&&(e.transport.removeAllListeners(),e.transport.close())},addEventListener("beforeunload",e.q,!1)),"localhost"!==e.hostname&&(e.N=function(){e.V("transport close",{description:"network connection lost"})},ht.push(e.N))),e.opts.withCredentials&&(e.X=void 0),e.H(),e}e(n,t);var r=n.prototype;return r.createTransport=function(t){var n=i({},this.opts.query);n.EIO=4,n.transport=t,this.id&&(n.sid=this.id);var r=i({},this.opts,{query:n,socket:this,hostname:this.hostname,secure:this.secure,port:this.port},this.opts.transportOptions[t]);return new this.$[t](r)},r.H=function(){var t=this;if(0!==this.transports.length){var i=this.opts.rememberUpgrade&&n.priorWebsocketSuccess&&-1!==this.transports.indexOf("websocket")?"websocket":this.transports[0];this.readyState="opening";var r=this.createTransport(i);r.open(),this.setTransport(r)}else this.setTimeoutFn((function(){t.emitReserved("error","No transports available")}),0)},r.setTransport=function(t){var n=this;this.transport&&this.transport.removeAllListeners(),this.transport=t,t.on("drain",this.F.bind(this)).on("packet",this.G.bind(this)).on("error",this.O.bind(this)).on("close",(function(t){return n.V("transport close",t)}))},r.onOpen=function(){this.readyState="open",n.priorWebsocketSuccess="websocket"===this.transport.name,this.emitReserved("open"),this.flush()},r.G=function(t){if("opening"===this.readyState||"open"===this.readyState||"closing"===this.readyState)switch(this.emitReserved("packet",t),this.emitReserved("heartbeat"),t.type){case"open":this.onHandshake(JSON.parse(t.data));break;case"ping":this.J("pong"),this.emitReserved("ping"),this.emitReserved("pong"),this.W();break;case"error":var n=new Error("server error");n.code=t.data,this.O(n);break;case"message":this.emitReserved("data",t.data),this.emitReserved("message",t.data)}},r.onHandshake=function(t){this.emitReserved("handshake",t),this.id=t.sid,this.transport.query.sid=t.sid,this.R=t.pingInterval,this.D=t.pingTimeout,this.P=t.maxPayload,this.onOpen(),"closed"!==this.readyState&&this.W()},r.W=function(){var t=this;this.clearTimeoutFn(this.K);var n=this.R+this.D;this.I=Date.now()+n,this.K=this.setTimeoutFn((function(){t.V("ping timeout")}),n),this.opts.autoUnref&&this.K.unref()},r.F=function(){this.writeBuffer.splice(0,this.L),this.L=0,0===this.writeBuffer.length?this.emitReserved("drain"):this.flush()},r.flush=function(){if("closed"!==this.readyState&&this.transport.writable&&!this.upgrading&&this.writeBuffer.length){var t=this.Y();this.transport.send(t),this.L=t.length,this.emitReserved("flush")}},r.Y=function(){if(!(this.P&&"polling"===this.transport.name&&this.writeBuffer.length>1))return this.writeBuffer;for(var t,n=1,i=0;i<this.writeBuffer.length;i++){var r=this.writeBuffer[i].data;if(r&&(n+="string"==typeof(t=r)?function(t){for(var n=0,i=0,r=0,e=t.length;r<e;r++)(n=t.charCodeAt(r))<128?i+=1:n<2048?i+=2:n<55296||n>=57344?i+=3:(r++,i+=4);return i}(t):Math.ceil(1.33*(t.byteLength||t.size))),i>0&&n>this.P)return this.writeBuffer.slice(0,i);n+=2}return this.writeBuffer},r.Z=function(){var t=this;if(!this.I)return!0;var n=Date.now()>this.I;return n&&(this.I=0,L((function(){t.V("ping timeout")}),this.setTimeoutFn)),n},r.write=function(t,n,i){return this.J("message",t,n,i),this},r.send=function(t,n,i){return this.J("message",t,n,i),this},r.J=function(t,n,i,r){if("function"==typeof n&&(r=n,n=void 0),"function"==typeof i&&(r=i,i=null),"closing"!==this.readyState&&"closed"!==this.readyState){(i=i||{}).compress=!1!==i.compress;var e={type:t,data:n,options:i};this.emitReserved("packetCreate",e),this.writeBuffer.push(e),r&&this.once("flush",r),this.flush()}},r.close=function(){var t=this,n=function(){t.V("forced close"),t.transport.close()},i=function i(){t.off("upgrade",i),t.off("upgradeError",i),n()},r=function(){t.once("upgrade",i),t.once("upgradeError",i)};return"opening"!==this.readyState&&"open"!==this.readyState||(this.readyState="closing",this.writeBuffer.length?this.once("drain",(function(){t.upgrading?r():n()})):this.upgrading?r():n()),this},r.O=function(t){if(n.priorWebsocketSuccess=!1,this.opts.tryAllTransports&&this.transports.length>1&&"opening"===this.readyState)return this.transports.shift(),this.H();this.emitReserved("error",t),this.V("transport error",t)},r.V=function(t,n){if("opening"===this.readyState||"open"===this.readyState||"closing"===this.readyState){if(this.clearTimeoutFn(this.K),this.transport.removeAllListeners("close"),this.transport.close(),this.transport.removeAllListeners(),ft&&(this.q&&removeEventListener("beforeunload",this.q,!1),this.N)){var i=ht.indexOf(this.N);-1!==i&&ht.splice(i,1)}this.readyState="closed",this.id=null,this.emitReserved("close",t,n),this.writeBuffer=[],this.L=0}},n}(C);ct.protocol=4;var at=function(t){function n(){var n;return(n=t.apply(this,arguments)||this)._=[],n}e(n,t);var i=n.prototype;return i.onOpen=function(){if(t.prototype.onOpen.call(this),"open"===this.readyState&&this.opts.upgrade)for(var n=0;n<this._.length;n++)this.tt(this._[n])},i.tt=function(t){var n=this,i=this.createTransport(t),r=!1;ct.priorWebsocketSuccess=!1;var e=function(){r||(i.send([{type:"ping",data:"probe"}]),i.once("packet",(function(t){if(!r)if("pong"===t.type&&"probe"===t.data){if(n.upgrading=!0,n.emitReserved("upgrading",i),!i)return;ct.priorWebsocketSuccess="websocket"===i.name,n.transport.pause((function(){r||"closed"!==n.readyState&&(c(),n.setTransport(i),i.send([{type:"upgrade"}]),n.emitReserved("upgrade",i),i=null,n.upgrading=!1,n.flush())}))}else{var e=new Error("probe error");e.transport=i.name,n.emitReserved("upgradeError",e)}})))};function o(){r||(r=!0,c(),i.close(),i=null)}var s=function(t){var r=new Error("probe error: "+t);r.transport=i.name,o(),n.emitReserved("upgradeError",r)};function u(){s("transport closed")}function f(){s("socket closed")}function h(t){i&&t.name!==i.name&&o()}var c=function(){i.removeListener("open",e),i.removeListener("error",s),i.removeListener("close",u),n.off("close",f),n.off("upgrading",h)};i.once("open",e),i.once("error",s),i.once("close",u),this.once("close",f),this.once("upgrading",h),-1!==this._.indexOf("webtransport")&&"webtransport"!==t?this.setTimeoutFn((function(){r||i.open()}),200):i.open()},i.onHandshake=function(n){this._=this.nt(n.upgrades),t.prototype.onHandshake.call(this,n)},i.nt=function(t){for(var n=[],i=0;i<t.length;i++)~this.transports.indexOf(t[i])&&n.push(t[i]);return n},n}(ct),pt=function(t){function n(n){var i=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},r="object"===f(n)?n:i;return(!r.transports||r.transports&&"string"==typeof r.transports[0])&&(r.transports=(r.transports||["polling","websocket","webtransport"]).map((function(t){return et[t]})).filter((function(t){return!!t}))),t.call(this,n,r)||this}return e(n,t),n}(at);return function(t,n){return new pt(t,n)}}));
diff --git a/packages/engine.io-client/lib/transports/websocket.node.ts b/packages/engine.io-client/lib/transports/websocket.node.ts
index 83777991c1..c587cceb73 100644
--- a/packages/engine.io-client/lib/transports/websocket.node.ts
+++ b/packages/engine.io-client/lib/transports/websocket.node.ts
@@ -1,4 +1,4 @@
-import { WebSocket } from "ws";
+import * as ws from "ws";
 import type { Packet, RawData } from "engine.io-parser";
 import { BaseWS } from "./websocket.js";
 
@@ -27,7 +27,7 @@ export class WS extends BaseWS {
         opts.headers.cookie.push(`${name}=${cookie.value}`);
       }
     }
-    return new WebSocket(uri, protocols, opts);
+    return new ws.WebSocket(uri, protocols, opts);
   }
 
   doWrite(packet: Packet, data: RawData) {
diff --git a/packages/engine.io-client/package.json b/packages/engine.io-client/package.json
index 95c5f2bba4..6cad940749 100644
--- a/packages/engine.io-client/package.json
+++ b/packages/engine.io-client/package.json
@@ -2,7 +2,7 @@
   "name": "engine.io-client",
   "description": "Client for the realtime Engine",
   "license": "MIT",
-  "version": "6.6.2",
+  "version": "6.6.3",
   "main": "./build/cjs/index.js",
   "module": "./build/esm/index.js",
   "exports": {
diff --git a/packages/engine.io-parser/lib/commons.ts b/packages/engine.io-parser/lib/commons.ts
index 2562382f72..bbbd43c262 100644
--- a/packages/engine.io-parser/lib/commons.ts
+++ b/packages/engine.io-parser/lib/commons.ts
@@ -32,7 +32,11 @@ export type RawData = any;
 
 export interface Packet {
   type: PacketType;
-  options?: { compress: boolean };
+  options?: {
+    compress: boolean;
+    wsPreEncoded?: string; // deprecated in favor of `wsPreEncodedFrame`
+    wsPreEncodedFrame?: any; // computed in the socket.io-adapter package (should be typed as Buffer)
+  };
   data?: RawData;
 }
 
diff --git a/packages/engine.io/CHANGELOG.md b/packages/engine.io/CHANGELOG.md
index 7105615476..0ae2948832 100644
--- a/packages/engine.io/CHANGELOG.md
+++ b/packages/engine.io/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 | Version                                                                                              | Release date   |
 |------------------------------------------------------------------------------------------------------|----------------|
+| [6.6.4](#664-2025-01-28)                                                                             | January 2025   |
+| [6.6.3](#663-2025-01-23)                                                                             | January 2025   |
 | [6.6.2](#662-2024-10-09)                                                                             | October 2024   |
 | [6.6.1](#661-2024-09-21)                                                                             | September 2024 |
 | [6.6.0](#660-2024-06-21)                                                                             | June 2024      |
@@ -47,6 +49,30 @@
 
 # Release notes
 
+## [6.6.4](https://github.com/socketio/socket.io/compare/engine.io@6.6.3...engine.io@6.6.4) (2025-01-28)
+
+The bump of the `cookie` dependency was reverted, as it drops support for older Node.js versions (< 14).
+
+
+### Dependencies
+
+- [`ws@~8.17.1`](https://github.com/websockets/ws/releases/tag/8.17.1) (no change)
+
+
+
+## [6.6.3](https://github.com/socketio/socket.io/compare/engine.io@6.6.2...engine.io@6.6.3) (2025-01-23)
+
+This release contains a bump of the `cookie` dependency.
+
+Release notes: https://github.com/jshttp/cookie/releases/tag/v1.0.0
+
+
+### Dependencies
+
+- [`ws@~8.17.1`](https://github.com/websockets/ws/releases/tag/8.17.1) (no change)
+
+
+
 ## [6.6.2](https://github.com/socketio/socket.io/compare/engine.io@6.6.1...engine.io@6.6.2) (2024-10-09)
 
 This release contains a bump of the `cookie` dependency.
diff --git a/packages/engine.io/lib/contrib/types.cookie.ts b/packages/engine.io/lib/contrib/types.cookie.ts
new file mode 100644
index 0000000000..7e546707e9
--- /dev/null
+++ b/packages/engine.io/lib/contrib/types.cookie.ts
@@ -0,0 +1,117 @@
+// imported from https://github.com/DefinitelyTyped/DefinitelyTyped/blob/b83cf9ef8b044e69f05b2a00aa7c6cb767a9acd2/types/cookie/index.d.ts (now deleted)
+/**
+ * Basic HTTP cookie parser and serializer for HTTP servers.
+ */
+
+/**
+ * Additional serialization options
+ */
+export interface CookieSerializeOptions {
+  /**
+   * Specifies the value for the {@link https://tools.ietf.org/html/rfc6265#section-5.2.3|Domain Set-Cookie attribute}. By default, no
+   * domain is set, and most clients will consider the cookie to apply to only
+   * the current domain.
+   */
+  domain?: string | undefined;
+
+  /**
+   * Specifies a function that will be used to encode a cookie's value. Since
+   * value of a cookie has a limited character set (and must be a simple
+   * string), this function can be used to encode a value into a string suited
+   * for a cookie's value.
+   *
+   * The default function is the global `encodeURIComponent`, which will
+   * encode a JavaScript string into UTF-8 byte sequences and then URL-encode
+   * any that fall outside of the cookie range.
+   */
+  encode?(value: string): string;
+
+  /**
+   * Specifies the `Date` object to be the value for the {@link https://tools.ietf.org/html/rfc6265#section-5.2.1|`Expires` `Set-Cookie` attribute}. By default,
+   * no expiration is set, and most clients will consider this a "non-persistent cookie" and will delete
+   * it on a condition like exiting a web browser application.
+   *
+   * *Note* the {@link https://tools.ietf.org/html/rfc6265#section-5.3|cookie storage model specification}
+   * states that if both `expires` and `maxAge` are set, then `maxAge` takes precedence, but it is
+   * possible not all clients by obey this, so if both are set, they should
+   * point to the same date and time.
+   */
+  expires?: Date | undefined;
+  /**
+   * Specifies the boolean value for the {@link https://tools.ietf.org/html/rfc6265#section-5.2.6|`HttpOnly` `Set-Cookie` attribute}.
+   * When truthy, the `HttpOnly` attribute is set, otherwise it is not. By
+   * default, the `HttpOnly` attribute is not set.
+   *
+   * *Note* be careful when setting this to true, as compliant clients will
+   * not allow client-side JavaScript to see the cookie in `document.cookie`.
+   */
+  httpOnly?: boolean | undefined;
+  /**
+   * Specifies the number (in seconds) to be the value for the `Max-Age`
+   * `Set-Cookie` attribute. The given number will be converted to an integer
+   * by rounding down. By default, no maximum age is set.
+   *
+   * *Note* the {@link https://tools.ietf.org/html/rfc6265#section-5.3|cookie storage model specification}
+   * states that if both `expires` and `maxAge` are set, then `maxAge` takes precedence, but it is
+   * possible not all clients by obey this, so if both are set, they should
+   * point to the same date and time.
+   */
+  maxAge?: number | undefined;
+  /**
+   * Specifies the `boolean` value for the [`Partitioned` `Set-Cookie`](rfc-cutler-httpbis-partitioned-cookies)
+   * attribute. When truthy, the `Partitioned` attribute is set, otherwise it is not. By default, the
+   * `Partitioned` attribute is not set.
+   *
+   * **note** This is an attribute that has not yet been fully standardized, and may change in the future.
+   * This also means many clients may ignore this attribute until they understand it.
+   *
+   * More information about can be found in [the proposal](https://github.com/privacycg/CHIPS)
+   */
+  partitioned?: boolean | undefined;
+  /**
+   * Specifies the value for the {@link https://tools.ietf.org/html/rfc6265#section-5.2.4|`Path` `Set-Cookie` attribute}.
+   * By default, the path is considered the "default path".
+   */
+  path?: string | undefined;
+  /**
+   * Specifies the `string` to be the value for the [`Priority` `Set-Cookie` attribute][rfc-west-cookie-priority-00-4.1].
+   *
+   * - `'low'` will set the `Priority` attribute to `Low`.
+   * - `'medium'` will set the `Priority` attribute to `Medium`, the default priority when not set.
+   * - `'high'` will set the `Priority` attribute to `High`.
+   *
+   * More information about the different priority levels can be found in
+   * [the specification][rfc-west-cookie-priority-00-4.1].
+   *
+   * **note** This is an attribute that has not yet been fully standardized, and may change in the future.
+   * This also means many clients may ignore this attribute until they understand it.
+   */
+  priority?: "low" | "medium" | "high" | undefined;
+  /**
+   * Specifies the boolean or string to be the value for the {@link https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-03#section-4.1.2.7|`SameSite` `Set-Cookie` attribute}.
+   *
+   * - `true` will set the `SameSite` attribute to `Strict` for strict same
+   * site enforcement.
+   * - `false` will not set the `SameSite` attribute.
+   * - `'lax'` will set the `SameSite` attribute to Lax for lax same site
+   * enforcement.
+   * - `'strict'` will set the `SameSite` attribute to Strict for strict same
+   * site enforcement.
+   *  - `'none'` will set the SameSite attribute to None for an explicit
+   *  cross-site cookie.
+   *
+   * More information about the different enforcement levels can be found in {@link https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-03#section-4.1.2.7|the specification}.
+   *
+   * *note* This is an attribute that has not yet been fully standardized, and may change in the future. This also means many clients may ignore this attribute until they understand it.
+   */
+  sameSite?: true | false | "lax" | "strict" | "none" | undefined;
+  /**
+   * Specifies the boolean value for the {@link https://tools.ietf.org/html/rfc6265#section-5.2.5|`Secure` `Set-Cookie` attribute}. When truthy, the
+   * `Secure` attribute is set, otherwise it is not. By default, the `Secure` attribute is not set.
+   *
+   * *Note* be careful when setting this to `true`, as compliant clients will
+   * not send the cookie back to the server in the future if the browser does
+   * not have an HTTPS connection.
+   */
+  secure?: boolean | undefined;
+}
diff --git a/packages/engine.io/lib/engine.io.ts b/packages/engine.io/lib/engine.io.ts
index 3ba9e67f8f..54ed1a4c9b 100644
--- a/packages/engine.io/lib/engine.io.ts
+++ b/packages/engine.io/lib/engine.io.ts
@@ -1,27 +1,36 @@
-import { createServer } from "http";
+import { createServer, Server as HttpServer } from "http";
 import { Server, AttachOptions, ServerOptions } from "./server";
 import transports from "./transports/index";
 import * as parser from "engine.io-parser";
 
 export { Server, transports, listen, attach, parser };
-export type { AttachOptions, ServerOptions, BaseServer } from "./server";
+export type {
+  AttachOptions,
+  ServerOptions,
+  BaseServer,
+  ErrorCallback,
+} from "./server";
 export { uServer } from "./userver";
 export { Socket } from "./socket";
 export { Transport } from "./transport";
 export const protocol = parser.protocol;
 
 /**
- * Creates an http.Server exclusively used for WS upgrades.
+ * Creates an http.Server exclusively used for WS upgrades, and starts listening.
  *
- * @param {Number} port
- * @param {Function} callback
- * @param {Object} options
- * @return {Server} websocket.io server
+ * @param port
+ * @param options
+ * @param listenCallback - callback for http.Server.listen()
+ * @return engine.io server
  */
 
-function listen(port, options: AttachOptions & ServerOptions, fn) {
+function listen(
+  port: number,
+  options?: AttachOptions & ServerOptions,
+  listenCallback?: () => void,
+): Server {
   if ("function" === typeof options) {
-    fn = options;
+    listenCallback = options;
     options = {};
   }
 
@@ -34,7 +43,7 @@ function listen(port, options: AttachOptions & ServerOptions, fn) {
   const engine = attach(server, options);
   engine.httpServer = server;
 
-  server.listen(port, fn);
+  server.listen(port, listenCallback);
 
   return engine;
 }
@@ -42,12 +51,15 @@ function listen(port, options: AttachOptions & ServerOptions, fn) {
 /**
  * Captures upgrade requests for a http.Server.
  *
- * @param {http.Server} server
- * @param {Object} options
- * @return {Server} engine server
+ * @param server
+ * @param options
+ * @return engine.io server
  */
 
-function attach(server, options: AttachOptions & ServerOptions) {
+function attach(
+  server: HttpServer,
+  options: AttachOptions & ServerOptions,
+): Server {
   const engine = new Server(options);
   engine.attach(server, options);
   return engine;
diff --git a/packages/engine.io/lib/parser-v3/index.ts b/packages/engine.io/lib/parser-v3/index.ts
index 367ae13767..8cf34dc2f2 100644
--- a/packages/engine.io/lib/parser-v3/index.ts
+++ b/packages/engine.io/lib/parser-v3/index.ts
@@ -59,8 +59,7 @@ const EMPTY_BUFFER = Buffer.concat([]);
  *
  * @api private
  */
-
-export function encodePacket (packet, supportsBinary, utf8encode, callback) {
+export function encodePacket (packet: any, supportsBinary?: any, utf8encode?: any, callback?: any) {
   if (typeof supportsBinary === 'function') {
     callback = supportsBinary;
     supportsBinary = null;
@@ -86,7 +85,7 @@ export function encodePacket (packet, supportsBinary, utf8encode, callback) {
   }
 
   return callback('' + encoded);
-};
+}
 
 /**
  * Encode Buffer data
@@ -120,16 +119,16 @@ export function encodeBase64Packet (packet, callback){
 /**
  * Decodes a packet. Data also available as an ArrayBuffer if requested.
  *
- * @return {Object} with `type` and `data` (if any)
+ * @return {import('engine.io-parser').Packet} with `type` and `data` (if any)
  * @api private
  */
 
-export function decodePacket (data, binaryType, utf8decode) {
+export function decodePacket (data: any, binaryType?: any, utf8decode?: any): any {
   if (data === undefined) {
     return err;
   }
 
-  var type;
+  let type: string | number;
 
   // String data
   if (typeof data === 'string') {
@@ -147,6 +146,7 @@ export function decodePacket (data, binaryType, utf8decode) {
       }
     }
 
+    // @ts-expect-error
     if (Number(type) != type || !packetslist[type]) {
       return err;
     }
@@ -274,7 +274,7 @@ function map(ary, each, done) {
  * @api public
  */
 
-export function decodePayload (data, binaryType, callback) {
+export function decodePayload (data: any, binaryType?: any, callback?: any) {
   if (typeof data !== 'string') {
     return decodePayloadAsBinary(data, binaryType, callback);
   }
diff --git a/packages/engine.io/lib/server.ts b/packages/engine.io/lib/server.ts
index 0e3ae063ef..1491070017 100644
--- a/packages/engine.io/lib/server.ts
+++ b/packages/engine.io/lib/server.ts
@@ -6,24 +6,34 @@ import { EventEmitter } from "events";
 import { Socket } from "./socket";
 import debugModule from "debug";
 import { serialize } from "cookie";
-import { Server as DEFAULT_WS_ENGINE } from "ws";
+import {
+  Server as DEFAULT_WS_ENGINE,
+  type Server as WsServer,
+  type PerMessageDeflateOptions,
+  type WebSocket as WsWebSocket,
+} from "ws";
 import type {
   IncomingMessage,
   Server as HttpServer,
   ServerResponse,
 } from "http";
-import type { CookieSerializeOptions } from "cookie";
 import type { CorsOptions, CorsOptionsDelegate } from "cors";
 import type { Duplex } from "stream";
 import { WebTransport } from "./transports/webtransport";
 import { createPacketDecoderStream } from "engine.io-parser";
-import type { EngineRequest } from "./transport";
+import type { EngineRequest, Transport } from "./transport";
+import type { CookieSerializeOptions } from "./contrib/types.cookie";
 
 const debug = debugModule("engine");
 
 const kResponseHeaders = Symbol("responseHeaders");
 
-type Transport = "polling" | "websocket" | "webtransport";
+type TransportName = "polling" | "websocket" | "webtransport";
+
+export type ErrorCallback = (
+  errorCode?: (typeof Server.errors)[keyof typeof Server.errors],
+  errorContext?: Record<string, unknown> & { name?: string; message?: string },
+) => void;
 
 export interface AttachOptions {
   /**
@@ -90,7 +100,7 @@ export interface ServerOptions {
    *
    * @default ["polling", "websocket"]
    */
-  transports?: Transport[];
+  transports?: TransportName[];
   /**
    * whether to allow transport upgrades
    * @default true
@@ -100,7 +110,7 @@ export interface ServerOptions {
    * parameters of the WebSocket permessage-deflate extension (see ws module api docs). Set to false to disable.
    * @default false
    */
-  perMessageDeflate?: boolean | object;
+  perMessageDeflate?: boolean | PerMessageDeflateOptions;
   /**
    * parameters of the http compression for the polling transports (see zlib api docs). Set to false to disable.
    * @default true
@@ -149,7 +159,7 @@ type Middleware = (
   next: (err?: any) => void,
 ) => void;
 
-function parseSessionId(data: string) {
+function parseSessionId(data: string): string | undefined {
   try {
     const parsed = JSON.parse(data);
     if (typeof parsed.sid === "string") {
@@ -224,7 +234,7 @@ export abstract class BaseServer extends EventEmitter {
     this.init();
   }
 
-  protected abstract init();
+  protected abstract init(): void;
 
   /**
    * Compute the pathname of the requests that are handled by the server
@@ -244,10 +254,8 @@ export abstract class BaseServer extends EventEmitter {
 
   /**
    * Returns a list of available transports for upgrade given a certain transport.
-   *
-   * @return {Array}
    */
-  public upgrades(transport: string) {
+  public upgrades(transport: TransportName): string[] {
     if (!this.opts.allowUpgrades) return [];
     return transports[transport].upgradesTo || [];
   }
@@ -259,17 +267,18 @@ export abstract class BaseServer extends EventEmitter {
    * @param upgrade - whether it's an upgrade request
    * @param fn
    * @protected
+   * @return whether the request is valid
    */
   protected verify(
-    req: any,
+    req: EngineRequest,
     upgrade: boolean,
-    fn: (errorCode?: number, errorContext?: any) => void,
-  ) {
+    fn: ErrorCallback,
+  ): void | boolean {
     // transport check
     const transport = req._query.transport;
     // WebTransport does not go through the verify() method, see the onWebTransportSession() method
     if (
-      !~this.opts.transports.indexOf(transport) ||
+      !~this.opts.transports.indexOf(transport as TransportName) ||
       transport === "webtransport"
     ) {
       debug('unknown transport "%s"', transport);
@@ -408,7 +417,7 @@ export abstract class BaseServer extends EventEmitter {
    *
    * @param {IncomingMessage} req - the request object
    */
-  public generateId(req: IncomingMessage) {
+  public generateId(req: IncomingMessage): string | PromiseLike<string> {
     return base64id.generateId();
   }
 
@@ -422,9 +431,9 @@ export abstract class BaseServer extends EventEmitter {
    * @protected
    */
   protected async handshake(
-    transportName: string,
-    req: any,
-    closeConnection: (errorCode?: number, errorContext?: any) => void,
+    transportName: TransportName,
+    req: EngineRequest,
+    closeConnection: ErrorCallback,
   ) {
     const protocol = req._query.EIO === "4" ? 4 : 3; // 3rd revision by default
     if (protocol === 3 && !this.opts.allowEIO3) {
@@ -600,7 +609,10 @@ export abstract class BaseServer extends EventEmitter {
     }
   }
 
-  protected abstract createTransport(transportName, req);
+  protected abstract createTransport(
+    transportName: TransportName,
+    req: EngineRequest,
+  );
 
   /**
    * Protocol errors mappings.
@@ -613,7 +625,7 @@ export abstract class BaseServer extends EventEmitter {
     BAD_REQUEST: 3,
     FORBIDDEN: 4,
     UNSUPPORTED_PROTOCOL_VERSION: 5,
-  };
+  } as const;
 
   static errorMessages = {
     0: "Transport unknown",
@@ -622,7 +634,7 @@ export abstract class BaseServer extends EventEmitter {
     3: "Bad request",
     4: "Forbidden",
     5: "Unsupported protocol version",
-  };
+  } as const;
 }
 
 /**
@@ -667,7 +679,7 @@ class WebSocketResponse {
  */
 export class Server extends BaseServer {
   public httpServer?: HttpServer;
-  private ws: any;
+  private ws: WsServer;
 
   /**
    * Initialize websocket server
@@ -687,7 +699,7 @@ export class Server extends BaseServer {
     });
 
     if (typeof this.ws.on === "function") {
-      this.ws.on("headers", (headersArray, req) => {
+      this.ws.on("headers", (headersArray, req: EngineRequest) => {
         // note: 'ws' uses an array of headers, while Engine.IO uses an object (response.writeHead() accepts both formats)
         // we could also try to parse the array and then sync the values, but that will be error-prone
         const additionalHeaders = req[kResponseHeaders] || {};
@@ -730,7 +742,11 @@ export class Server extends BaseServer {
     }
   }
 
-  protected createTransport(transportName: string, req: IncomingMessage) {
+  protected createTransport(
+    transportName: TransportName,
+    req: IncomingMessage,
+  ): Transport {
+    // @ts-expect-error 'polling' is a plain function used as constructor
     return new transports[transportName](req);
   }
 
@@ -745,7 +761,7 @@ export class Server extends BaseServer {
     this.prepare(req);
     req.res = res;
 
-    const callback = (errorCode, errorContext) => {
+    const callback: ErrorCallback = (errorCode, errorContext) => {
       if (errorCode !== undefined) {
         this.emit("connection_error", {
           req,
@@ -763,7 +779,11 @@ export class Server extends BaseServer {
       } else {
         const closeConnection = (errorCode, errorContext) =>
           abortRequest(res, errorCode, errorContext);
-        this.handshake(req._query.transport, req, closeConnection);
+        this.handshake(
+          req._query.transport as TransportName,
+          req,
+          closeConnection,
+        );
       }
     };
 
@@ -787,7 +807,7 @@ export class Server extends BaseServer {
     this.prepare(req);
 
     const res = new WebSocketResponse(req, socket);
-    const callback = (errorCode, errorContext) => {
+    const callback: ErrorCallback = (errorCode, errorContext) => {
       if (errorCode !== undefined) {
         this.emit("connection_error", {
           req,
@@ -823,11 +843,16 @@ export class Server extends BaseServer {
 
   /**
    * Called upon a ws.io connection.
-   *
-   * @param {ws.Socket} websocket
+   * @param req
+   * @param socket
+   * @param websocket
    * @private
    */
-  private onWebSocket(req, socket, websocket) {
+  private onWebSocket(
+    req: EngineRequest,
+    socket: Duplex,
+    websocket: WsWebSocket,
+  ) {
     websocket.on("error", onUpgradeError);
 
     if (
@@ -862,14 +887,22 @@ export class Server extends BaseServer {
         // transport error handling takes over
         websocket.removeListener("error", onUpgradeError);
 
-        const transport = this.createTransport(req._query.transport, req);
+        const transport = this.createTransport(
+          req._query.transport as TransportName,
+          req,
+        );
+        // @ts-expect-error this option is only for WebSocket impl
         transport.perMessageDeflate = this.opts.perMessageDeflate;
         client._maybeUpgrade(transport);
       }
     } else {
       const closeConnection = (errorCode, errorContext) =>
         abortUpgrade(socket, errorCode, errorContext);
-      this.handshake(req._query.transport, req, closeConnection);
+      this.handshake(
+        req._query.transport as TransportName,
+        req,
+        closeConnection,
+      );
     }
 
     function onUpgradeError() {
@@ -947,7 +980,11 @@ export class Server extends BaseServer {
  * @private
  */
 
-function abortRequest(res, errorCode, errorContext) {
+function abortRequest(
+  res: ServerResponse,
+  errorCode: number,
+  errorContext?: { message?: string },
+) {
   const statusCode = errorCode === Server.errors.FORBIDDEN ? 403 : 400;
   const message =
     errorContext && errorContext.message
@@ -1030,7 +1067,7 @@ const validHdrChars = [
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1  // ... 255
 ]
 
-function checkInvalidHeaderChar(val) {
+function checkInvalidHeaderChar(val?: string) {
   val += "";
   if (val.length < 1) return false;
   if (!validHdrChars[val.charCodeAt(0)]) {
diff --git a/packages/engine.io/lib/socket.ts b/packages/engine.io/lib/socket.ts
index bfe6d3ba1d..c2efe8ebbe 100644
--- a/packages/engine.io/lib/socket.ts
+++ b/packages/engine.io/lib/socket.ts
@@ -5,6 +5,7 @@ import type { EngineRequest, Transport } from "./transport";
 import type { BaseServer } from "./server";
 import { setTimeout, clearTimeout } from "timers";
 import type { Packet, PacketType, RawData } from "engine.io-parser";
+import type transports from "./transports";
 
 const debug = debugModule("engine:socket");
 
@@ -537,9 +538,11 @@ export class Socket extends EventEmitter {
    */
   private getAvailableUpgrades() {
     const availableUpgrades = [];
-    const allUpgrades = this.server.upgrades(this.transport.name);
+    const allUpgrades = this.server.upgrades(
+      this.transport.name as keyof typeof transports,
+    );
     for (let i = 0; i < allUpgrades.length; ++i) {
-      const upg = allUpgrades[i];
+      const upg = allUpgrades[i] as keyof typeof transports;
       if (this.server.opts.transports.indexOf(upg) !== -1) {
         availableUpgrades.push(upg);
       }
diff --git a/packages/engine.io/lib/transport.ts b/packages/engine.io/lib/transport.ts
index 1121e4e348..6d3b9cbf62 100644
--- a/packages/engine.io/lib/transport.ts
+++ b/packages/engine.io/lib/transport.ts
@@ -4,6 +4,7 @@ import * as parser_v3 from "./parser-v3/index";
 import debugModule from "debug";
 import type { IncomingMessage, ServerResponse } from "http";
 import { Packet, RawData } from "engine.io-parser";
+import type { WebSocket } from "ws";
 
 const debug = debugModule("engine:transport");
 
@@ -15,7 +16,11 @@ export type EngineRequest = IncomingMessage & {
   _query: Record<string, string>;
   res?: ServerResponse;
   cleanup?: Function;
-  websocket?: any;
+  websocket?: WebSocket & {
+    _socket?: {
+      remoteAddress: string;
+    };
+  };
 };
 
 export abstract class Transport extends EventEmitter {
@@ -37,7 +42,7 @@ export abstract class Transport extends EventEmitter {
    *
    * @see https://github.com/socketio/engine.io-protocol
    */
-  public protocol: number;
+  public protocol: 3 | 4;
 
   /**
    * The current state of the transport.
@@ -53,7 +58,7 @@ export abstract class Transport extends EventEmitter {
    * The parser to use (depends on the revision of the {@link Transport#protocol}.
    * @protected
    */
-  protected parser: any;
+  protected parser: typeof parser_v4 | typeof parser_v3;
   /**
    * Whether the transport supports binary payloads (else it will be base64-encoded)
    * @protected
@@ -74,6 +79,11 @@ export abstract class Transport extends EventEmitter {
     this._readyState = state;
   }
 
+  /**
+   * The list of transports this transport can be upgraded to.
+   */
+  static upgradesTo: string[] = [];
+
   /**
    * Transport constructor.
    *
@@ -148,7 +158,7 @@ export abstract class Transport extends EventEmitter {
   /**
    * Called with the encoded packet data.
    *
-   * @param {String} data
+   * @param data
    * @protected
    */
   protected onData(data: RawData) {
diff --git a/packages/engine.io/lib/transports-uws/polling.ts b/packages/engine.io/lib/transports-uws/polling.ts
index 090270ec2f..7463b3b3d3 100644
--- a/packages/engine.io/lib/transports-uws/polling.ts
+++ b/packages/engine.io/lib/transports-uws/polling.ts
@@ -3,6 +3,8 @@ import { createGzip, createDeflate } from "zlib";
 import * as accepts from "accepts";
 import debugModule from "debug";
 import { HttpRequest, HttpResponse } from "uWebSockets.js";
+import type * as parser_v4 from "engine.io-parser";
+import type * as parser_v3 from "../parser-v3/index";
 
 const debug = debugModule("engine:polling");
 
@@ -228,9 +230,9 @@ export class Polling extends Transport {
     };
 
     if (this.protocol === 3) {
-      this.parser.decodePayload(data, callback);
+      (this.parser as typeof parser_v3).decodePayload(data, callback);
     } else {
-      this.parser.decodePayload(data).forEach(callback);
+      (this.parser as typeof parser_v4).decodePayload(data).forEach(callback);
     }
   }
 
@@ -263,7 +265,7 @@ export class Polling extends Transport {
       this.shouldClose = null;
     }
 
-    const doWrite = (data) => {
+    const doWrite = (data: string) => {
       const compress = packets.some((packet) => {
         return packet.options && packet.options.compress;
       });
@@ -271,9 +273,13 @@ export class Polling extends Transport {
     };
 
     if (this.protocol === 3) {
-      this.parser.encodePayload(packets, this.supportsBinary, doWrite);
+      (this.parser as typeof parser_v3).encodePayload(
+        packets,
+        this.supportsBinary,
+        doWrite,
+      );
     } else {
-      this.parser.encodePayload(packets, doWrite);
+      (this.parser as typeof parser_v4).encodePayload(packets, doWrite);
     }
   }
 
diff --git a/packages/engine.io/lib/transports/index.ts b/packages/engine.io/lib/transports/index.ts
index e585112bb1..47b3f17be1 100644
--- a/packages/engine.io/lib/transports/index.ts
+++ b/packages/engine.io/lib/transports/index.ts
@@ -2,9 +2,10 @@ import { Polling as XHR } from "./polling";
 import { JSONP } from "./polling-jsonp";
 import { WebSocket } from "./websocket";
 import { WebTransport } from "./webtransport";
+import type { EngineRequest } from "../transport";
 
 export default {
-  polling: polling,
+  polling,
   websocket: WebSocket,
   webtransport: WebTransport,
 };
@@ -12,8 +13,7 @@ export default {
 /**
  * Polling polymorphic constructor.
  */
-
-function polling(req) {
+function polling(req: EngineRequest) {
   if ("string" === typeof req._query.j) {
     return new JSONP(req);
   } else {
diff --git a/packages/engine.io/lib/transports/polling.ts b/packages/engine.io/lib/transports/polling.ts
index 1f46335934..15e492a19c 100644
--- a/packages/engine.io/lib/transports/polling.ts
+++ b/packages/engine.io/lib/transports/polling.ts
@@ -4,6 +4,8 @@ import * as accepts from "accepts";
 import debugModule from "debug";
 import type { IncomingMessage, ServerResponse } from "http";
 import type { Packet, RawData } from "engine.io-parser";
+import type * as parser_v4 from "engine.io-parser";
+import type * as parser_v3 from "../parser-v3/index";
 
 const debug = debugModule("engine:polling");
 
@@ -196,9 +198,9 @@ export class Polling extends Transport {
     };
 
     if (this.protocol === 3) {
-      this.parser.decodePayload(data, callback);
+      (this.parser as typeof parser_v3).decodePayload(data, callback);
     } else {
-      this.parser.decodePayload(data).forEach(callback);
+      (this.parser as typeof parser_v4).decodePayload(data).forEach(callback);
     }
   }
 
@@ -225,7 +227,7 @@ export class Polling extends Transport {
       this.shouldClose = null;
     }
 
-    const doWrite = (data) => {
+    const doWrite = (data: string) => {
       const compress = packets.some((packet) => {
         return packet.options && packet.options.compress;
       });
@@ -233,9 +235,13 @@ export class Polling extends Transport {
     };
 
     if (this.protocol === 3) {
-      this.parser.encodePayload(packets, this.supportsBinary, doWrite);
+      (this.parser as typeof parser_v3).encodePayload(
+        packets,
+        this.supportsBinary,
+        doWrite,
+      );
     } else {
-      this.parser.encodePayload(packets, doWrite);
+      (this.parser as typeof parser_v4).encodePayload(packets, doWrite);
     }
   }
 
diff --git a/packages/engine.io/lib/transports/websocket.ts b/packages/engine.io/lib/transports/websocket.ts
index a95f4b0f19..ebc0553fbf 100644
--- a/packages/engine.io/lib/transports/websocket.ts
+++ b/packages/engine.io/lib/transports/websocket.ts
@@ -1,12 +1,13 @@
 import { EngineRequest, Transport } from "../transport";
 import debugModule from "debug";
 import type { Packet, RawData } from "engine.io-parser";
+import type { PerMessageDeflateOptions, WebSocket as WsWebSocket } from "ws";
 
 const debug = debugModule("engine:ws");
 
 export class WebSocket extends Transport {
-  protected perMessageDeflate: any;
-  private socket: any;
+  perMessageDeflate?: boolean | PerMessageDeflateOptions;
+  private socket: WsWebSocket;
 
   /**
    * WebSocket transport
@@ -51,8 +52,8 @@ export class WebSocket extends Transport {
       if (this._canSendPreEncodedFrame(packet)) {
         // the WebSocket frame was computed with WebSocket.Sender.frame()
         // see https://github.com/websockets/ws/issues/617#issuecomment-283002469
+        // @ts-expect-error use of untyped member
         this.socket._sender.sendFrame(
-          // @ts-ignore
           packet.options.wsPreEncodedFrame,
           isLast ? this._onSentLast : this._onSent,
         );
@@ -74,8 +75,8 @@ export class WebSocket extends Transport {
   private _canSendPreEncodedFrame(packet: Packet) {
     return (
       !this.perMessageDeflate &&
+      // @ts-expect-error use of untyped member
       typeof this.socket?._sender?.sendFrame === "function" &&
-      // @ts-ignore
       packet.options?.wsPreEncodedFrame !== undefined
     );
   }
diff --git a/packages/engine.io/lib/userver.ts b/packages/engine.io/lib/userver.ts
index e8fb47f580..71ed616fbb 100644
--- a/packages/engine.io/lib/userver.ts
+++ b/packages/engine.io/lib/userver.ts
@@ -2,6 +2,7 @@ import debugModule from "debug";
 import { AttachOptions, BaseServer, Server } from "./server";
 import { HttpRequest, HttpResponse, TemplatedApp } from "uWebSockets.js";
 import transports from "./transports-uws";
+import { EngineRequest } from "./transport";
 
 const debug = debugModule("engine:uws");
 
@@ -36,7 +37,7 @@ export class uServer extends BaseServer {
    *
    * @private
    */
-  private prepare(req, res: HttpResponse) {
+  private prepare(req: HttpRequest & EngineRequest, res: HttpResponse) {
     req.method = req.getMethod().toUpperCase();
     req.url = req.getUrl();
 
@@ -48,6 +49,7 @@ export class uServer extends BaseServer {
       req.headers[key] = value;
     });
 
+    // @ts-expect-error
     req.connection = {
       remoteAddress: Buffer.from(res.getRemoteAddressAsText()).toString(),
     };
@@ -57,7 +59,7 @@ export class uServer extends BaseServer {
     });
   }
 
-  protected createTransport(transportName, req) {
+  protected createTransport(transportName: string, req: EngineRequest) {
     return new transports[transportName](req);
   }
 
@@ -123,7 +125,7 @@ export class uServer extends BaseServer {
     req: HttpRequest & { res: any; _query: any },
   ) {
     debug('handling "%s" http request "%s"', req.getMethod(), req.getUrl());
-    this.prepare(req, res);
+    this.prepare(req as unknown as HttpRequest & EngineRequest, res);
 
     req.res = res;
 
@@ -146,7 +148,11 @@ export class uServer extends BaseServer {
       } else {
         const closeConnection = (errorCode, errorContext) =>
           this.abortRequest(res, errorCode, errorContext);
-        this.handshake(req._query.transport, req, closeConnection);
+        this.handshake(
+          req._query.transport,
+          req as unknown as EngineRequest,
+          closeConnection,
+        );
       }
     };
 
@@ -154,7 +160,11 @@ export class uServer extends BaseServer {
       if (err) {
         callback(Server.errors.BAD_REQUEST, { name: "MIDDLEWARE_FAILURE" });
       } else {
-        this.verify(req, false, callback);
+        this.verify(
+          req as unknown as HttpRequest & EngineRequest,
+          false,
+          callback,
+        );
       }
     });
   }
@@ -166,7 +176,7 @@ export class uServer extends BaseServer {
   ) {
     debug("on upgrade");
 
-    this.prepare(req, res);
+    this.prepare(req as unknown as HttpRequest & EngineRequest, res);
 
     req.res = res;
 
@@ -198,13 +208,16 @@ export class uServer extends BaseServer {
           return res.close();
         } else {
           debug("upgrading existing transport");
-          transport = this.createTransport(req._query.transport, req);
+          transport = this.createTransport(
+            req._query.transport,
+            req as unknown as EngineRequest,
+          );
           client._maybeUpgrade(transport);
         }
       } else {
         transport = await this.handshake(
           req._query.transport,
-          req,
+          req as unknown as EngineRequest,
           (errorCode, errorContext) =>
             this.abortRequest(res, errorCode, errorContext),
         );
@@ -231,15 +244,15 @@ export class uServer extends BaseServer {
       if (err) {
         callback(Server.errors.BAD_REQUEST, { name: "MIDDLEWARE_FAILURE" });
       } else {
-        this.verify(req, true, callback);
+        this.verify(req as unknown as EngineRequest, true, callback);
       }
     });
   }
 
   private abortRequest(
     res: HttpResponse | ResponseWrapper,
-    errorCode,
-    errorContext,
+    errorCode: number,
+    errorContext?: { message?: string },
   ) {
     const statusCode =
       errorCode === Server.errors.FORBIDDEN
diff --git a/packages/engine.io/package.json b/packages/engine.io/package.json
index 6c126c6b71..ed8386ea3b 100644
--- a/packages/engine.io/package.json
+++ b/packages/engine.io/package.json
@@ -1,6 +1,6 @@
 {
   "name": "engine.io",
-  "version": "6.6.2",
+  "version": "6.6.4",
   "description": "The realtime engine behind Socket.IO. Provides the foundation of a bidirectional connection between client and server",
   "type": "commonjs",
   "main": "./build/engine.io.js",
@@ -31,7 +31,6 @@
   ],
   "license": "MIT",
   "dependencies": {
-    "@types/cookie": "^0.4.1",
     "@types/cors": "^2.8.12",
     "@types/node": ">=10.0.0",
     "accepts": "~1.3.4",
diff --git a/packages/socket.io-adapter/lib/in-memory-adapter.ts b/packages/socket.io-adapter/lib/in-memory-adapter.ts
index 2b78e8285e..cf178170e0 100644
--- a/packages/socket.io-adapter/lib/in-memory-adapter.ts
+++ b/packages/socket.io-adapter/lib/in-memory-adapter.ts
@@ -1,6 +1,6 @@
 import { EventEmitter } from "events";
 import { yeast } from "./contrib/yeast";
-import WebSocket = require("ws");
+import * as WebSocket from "ws";
 
 // @ts-expect-error
 const canPreComputeFrame = typeof WebSocket?.Sender?.frame === "function";
@@ -51,11 +51,11 @@ export class Adapter extends EventEmitter {
   /**
    * In-memory adapter constructor.
    *
-   * @param {Namespace} nsp
+   * @param nsp
    */
   constructor(readonly nsp: any) {
     super();
-    this.encoder = nsp.server.encoder;
+    this.encoder = nsp.server.encoder; // nsp is a Namespace object
   }
 
   /**
diff --git a/packages/socket.io-cluster-engine/lib/engine.ts b/packages/socket.io-cluster-engine/lib/engine.ts
index 4972f31881..e12f643cb7 100644
--- a/packages/socket.io-cluster-engine/lib/engine.ts
+++ b/packages/socket.io-cluster-engine/lib/engine.ts
@@ -1,4 +1,10 @@
-import { Server, type ServerOptions, Socket, type Transport } from "engine.io";
+import {
+  Server,
+  type ServerOptions,
+  type ErrorCallback,
+  Socket,
+  type Transport,
+} from "engine.io";
 import { randomBytes } from "node:crypto";
 import { setTimeout, clearTimeout } from "node:timers";
 import { type IncomingMessage } from "node:http";
@@ -392,9 +398,9 @@ export abstract class ClusterEngine extends Server {
   override verify(
     req: IncomingMessage & { _query: Record<string, string> },
     upgrade: boolean,
-    fn: (errorCode?: number, context?: any) => void,
+    fn: ErrorCallback,
   ): void {
-    super.verify(req, upgrade, (errorCode: number, errorContext: any) => {
+    super.verify(req, upgrade, (errorCode, errorContext) => {
       if (errorCode !== Server.errors.UNKNOWN_SID) {
         return fn(errorCode, errorContext);
       }
@@ -412,7 +418,7 @@ export abstract class ClusterEngine extends Server {
           req[kSenderId] = senderId;
           fn();
         } else {
-          const transport = this.createTransport(transportName, req);
+          const transport = this.createTransport(transportName as any, req);
           this._hookTransport(sid, transport, lockType, senderId);
           transport.onRequest(req);
         }
diff --git a/packages/socket.io/lib/client.ts b/packages/socket.io/lib/client.ts
index 6ca7b77818..99ff42cd12 100644
--- a/packages/socket.io/lib/client.ts
+++ b/packages/socket.io/lib/client.ts
@@ -1,6 +1,6 @@
 import { Decoder, Encoder, Packet, PacketType } from "socket.io-parser";
-import debugModule = require("debug");
-import url = require("url");
+import debugModule from "debug";
+import url from "url";
 import type { IncomingMessage } from "http";
 import type { Server } from "./index";
 import type { Namespace } from "./namespace";
@@ -61,12 +61,13 @@ export class Client<
    */
   constructor(
     server: Server<ListenEvents, EmitEvents, ServerSideEvents, SocketData>,
-    conn: any,
+    conn: RawSocket,
   ) {
     this.server = server;
     this.conn = conn;
     this.encoder = server.encoder;
     this.decoder = new server._parser.Decoder();
+    // @ts-expect-error use of private
     this.id = conn.id;
     this.setup();
   }
@@ -216,13 +217,13 @@ export class Client<
    * @param {Object} opts
    * @private
    */
-  _packet(packet: Packet | any[], opts: WriteOptions = {}): void {
+  _packet(packet: Packet | Packet[], opts: WriteOptions = {}): void {
     if (this.conn.readyState !== "open") {
       debug("ignoring packet write %j", packet);
       return;
     }
     const encodedPackets = opts.preEncoded
-      ? (packet as any[]) // previous versions of the adapter incorrectly used socket.packet() instead of writeToEngine()
+      ? (packet as Packet[]) // previous versions of the adapter incorrectly used socket.packet() instead of writeToEngine()
       : this.encoder.encode(packet as Packet);
     this.writeToEngine(encodedPackets, opts);
   }
@@ -250,7 +251,7 @@ export class Client<
    *
    * @private
    */
-  private ondata(data): void {
+  private ondata(data: unknown): void {
     // try/catch is needed for protocol violations (GH-1880)
     try {
       this.decoder.add(data);
diff --git a/packages/socket.io/lib/index.ts b/packages/socket.io/lib/index.ts
index b77b8fd3fd..5653911b33 100644
--- a/packages/socket.io/lib/index.ts
+++ b/packages/socket.io/lib/index.ts
@@ -1,4 +1,4 @@
-import http = require("http");
+import http from "http";
 import type { Server as HTTPSServer } from "https";
 import type { Http2SecureServer, Http2Server } from "http2";
 import { createReadStream } from "fs";
@@ -7,7 +7,11 @@ import accepts = require("accepts");
 import { pipeline } from "stream";
 import path = require("path");
 import { attach, Server as Engine, uServer } from "engine.io";
-import type { ServerOptions as EngineOptions, AttachOptions } from "engine.io";
+import type {
+  ServerOptions as EngineOptions,
+  AttachOptions,
+  Socket as RawSocket,
+} from "engine.io";
 import { Client } from "./client";
 import { EventEmitter } from "events";
 import { ExtendedError, Namespace, ServerReservedEventsMap } from "./namespace";
@@ -506,6 +510,11 @@ export class Server<
     return this;
   }
 
+  /**
+   * Attaches socket.io to a uWebSockets.js app.
+   * @param app
+   * @param opts
+   */
   public attachApp(app /*: TemplatedApp */, opts: Partial<ServerOptions> = {}) {
     // merge the options passed to the Socket.IO server
     Object.assign(opts, this.opts);
@@ -582,7 +591,7 @@ export class Server<
   ): void {
     // initialize engine
     debug("creating engine.io instance with opts %j", opts);
-    this.eio = attach(srv, opts);
+    this.eio = attach(srv as http.Server, opts);
 
     // attach static file serving
     if (this._serveClient) this.attachServe(srv);
@@ -723,11 +732,12 @@ export class Server<
    * @return self
    * @private
    */
-  private onconnection(conn): this {
+  private onconnection(conn: RawSocket): this {
+    // @ts-expect-error use of private
     debug("incoming connection with id %s", conn.id);
     const client = new Client(this, conn);
     if (conn.protocol === 3) {
-      // @ts-ignore
+      // @ts-expect-error use of private
       client.connect("/");
     }
     return this;
diff --git a/packages/socket.io/lib/socket.ts b/packages/socket.io/lib/socket.ts
index 719b597e59..55131fcee7 100644
--- a/packages/socket.io/lib/socket.ts
+++ b/packages/socket.io/lib/socket.ts
@@ -163,7 +163,7 @@ export class Socket<
   ) {
     super();
     this.server = nsp.server;
-    this.adapter = this.nsp.adapter;
+    this.adapter = nsp.adapter;
     if (previousSession) {
       this.id = previousSession.sid;
       this.pid = previousSession.pid;