diff --git a/Package.swift b/Package.swift
index 04afd62..f093651 100644
--- a/Package.swift
+++ b/Package.swift
@@ -38,8 +38,8 @@ let package = Package(
         ),
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-nio", from: "2.51.0"),
-        .package(url: "https://github.com/swift-server/async-http-client.git", from: "1.17.0"),
+        .package(url: "https://github.com/apple/swift-nio", from: "2.58.0"),
+        .package(url: "https://github.com/swift-server/async-http-client.git", from: "1.19.0"),
         .package(url: "https://github.com/apple/swift-openapi-runtime", .upToNextMinor(from: "0.1.3")),
         .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0"),
     ],
diff --git a/Sources/OpenAPIAsyncHTTPClient/AsyncHTTPClientTransport.swift b/Sources/OpenAPIAsyncHTTPClient/AsyncHTTPClientTransport.swift
index 35cb654..1c5c27a 100644
--- a/Sources/OpenAPIAsyncHTTPClient/AsyncHTTPClientTransport.swift
+++ b/Sources/OpenAPIAsyncHTTPClient/AsyncHTTPClientTransport.swift
@@ -15,31 +15,24 @@ import OpenAPIRuntime
 import AsyncHTTPClient
 import NIOCore
 import NIOHTTP1
-import Foundation
 import NIOFoundationCompat
+#if canImport(Darwin)
+import Foundation
+#else
+@preconcurrency import struct Foundation.URL
+import struct Foundation.URLComponents
+import struct Foundation.Data
+import protocol Foundation.LocalizedError
+#endif
 
 /// A client transport that performs HTTP operations using the HTTPClient type
 /// provided by the AsyncHTTPClient library.
 ///
 /// ### Use the AsyncHTTPClient transport
 ///
-/// Create the underlying HTTP client:
-///
-///     let httpClient = HTTPClient(eventLoopGroupProvider: .createNew)
-///
-/// Either store a reference to the client elsewhere and shut it down during
-/// cleanup, or add a defer block if the client is only used in the current
-/// scope:
-///
-///     defer {
-///         try! httpClient.syncShutdown()
-///     }
+/// Instantiate the transport:
 ///
-/// Instantiate the transport and provide the HTTP client to it:
-///
-///     let transport = AsyncHTTPClientTransport(
-///         configuration: .init(client: httpClient)
-///     )
+///     let transport = AsyncHTTPClientTransport()
 ///
 /// Create the base URL of the server to call using your client. If the server
 /// URL was defined in the OpenAPI document, you find a generated method for it
@@ -61,6 +54,12 @@ import NIOFoundationCompat
 ///
 ///     let response = try await client.checkHealth(.init())
 ///     // ...
+///
+/// ### Provide a custom Client
+///
+/// The ``AsyncHTTPClientTransport/Configuration-swift.struct`` type allows you
+/// to provide a custom `HTTPClient` and tweak behaviors such as the default
+/// timeout.
 public struct AsyncHTTPClientTransport: ClientTransport {
 
     /// A set of configuration values for the AsyncHTTPClient transport.
@@ -76,7 +75,7 @@ public struct AsyncHTTPClientTransport: ClientTransport {
         /// - Parameters:
         ///   - client: The underlying client used to perform HTTP operations.
         ///   - timeout: The request timeout, defaults to 1 minute.
-        public init(client: HTTPClient, timeout: TimeAmount = .minutes(1)) {
+        public init(client: HTTPClient = .init(), timeout: TimeAmount = .minutes(1)) {
             self.client = client
             self.timeout = timeout
         }
diff --git a/Tests/OpenAPIAsyncHTTPClientTests/Test_AsyncHTTPClientTransport.swift b/Tests/OpenAPIAsyncHTTPClientTests/Test_AsyncHTTPClientTransport.swift
index b81fd02..f110257 100644
--- a/Tests/OpenAPIAsyncHTTPClientTests/Test_AsyncHTTPClientTransport.swift
+++ b/Tests/OpenAPIAsyncHTTPClientTests/Test_AsyncHTTPClientTransport.swift
@@ -63,7 +63,7 @@ class Test_AsyncHTTPClientTransport: XCTestCase {
     }
 
     func testConvertResponse() async throws {
-        let httpResponse: HTTPClientResponse = .init(
+        let httpResponse = HTTPClientResponse(
             status: .ok,
             headers: [
                 "content-type": "application/json"
@@ -83,7 +83,7 @@ class Test_AsyncHTTPClientTransport: XCTestCase {
 
     func testSend() async throws {
         let eventLoopGroup = MultiThreadedEventLoopGroup(numberOfThreads: 1)
-        let httpClient: HTTPClient = .init(
+        let httpClient = HTTPClient(
             eventLoopGroupProvider: .shared(eventLoopGroup),
             configuration: .init()
         )
diff --git a/docker/docker-compose.2204.58.yaml b/docker/docker-compose.2204.58.yaml
index eb4be59..eca0761 100644
--- a/docker/docker-compose.2204.58.yaml
+++ b/docker/docker-compose.2204.58.yaml
@@ -13,6 +13,7 @@ services:
     environment:
       - WARN_AS_ERROR_ARG=-Xswiftc -warnings-as-errors
       - IMPORT_CHECK_ARG=--explicit-target-dependency-import-check error
+      - STRICT_CONCURRENCY_ARG=-Xswiftc -strict-concurrency=complete
 
   shell:
     image: *image
diff --git a/docker/docker-compose.2204.59.yaml b/docker/docker-compose.2204.59.yaml
index a475877..1ac8741 100644
--- a/docker/docker-compose.2204.59.yaml
+++ b/docker/docker-compose.2204.59.yaml
@@ -12,6 +12,7 @@ services:
     environment:
       - WARN_AS_ERROR_ARG=-Xswiftc -warnings-as-errors
       - IMPORT_CHECK_ARG=--explicit-target-dependency-import-check error
+      - STRICT_CONCURRENCY_ARG=-Xswiftc -strict-concurrency=complete
 
   shell:
     image: *image
diff --git a/docker/docker-compose.2204.main.yaml b/docker/docker-compose.2204.main.yaml
index 31dbe00..b1443e6 100644
--- a/docker/docker-compose.2204.main.yaml
+++ b/docker/docker-compose.2204.main.yaml
@@ -12,6 +12,7 @@ services:
     environment:
       - WARN_AS_ERROR_ARG=-Xswiftc -warnings-as-errors
       - IMPORT_CHECK_ARG=--explicit-target-dependency-import-check error
+      - STRICT_CONCURRENCY_ARG=-Xswiftc -strict-concurrency=complete
 
   shell:
     image: *image
diff --git a/docker/docker-compose.yaml b/docker/docker-compose.yaml
index 994d8b4..055978f 100644
--- a/docker/docker-compose.yaml
+++ b/docker/docker-compose.yaml
@@ -30,7 +30,7 @@ services:
 
   test:
     <<: *common
-    command: /bin/bash -xcl "swift $${SWIFT_TEST_VERB-test} $${WARN_AS_ERROR_ARG-} $${SANITIZER_ARG-} $${IMPORT_CHECK_ARG-}"
+    command: /bin/bash -xcl "swift $${SWIFT_TEST_VERB-test} $${WARN_AS_ERROR_ARG-} $${SANITIZER_ARG-} $${IMPORT_CHECK_ARG-} $${STRICT_CONCURRENCY_ARG-}"
 
   shell:
     <<: *common