diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2f7c64..1adfb00 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 4.0.1
+
+ - upgrade sharedb
+
+
 ## 4.0.0
 
  - upgrade `pg` from 7.4.1 to 8.5.1 to prevent silent failure for node v14 or later, reported in [this issue](https://github.com/brianc/node-postgres/issues/2317). 
diff --git a/README.md b/README.md
index b73277b..9ee49de 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,13 @@ Moderately experimental. (This drives [Synaptograph](https://www.synaptograph.co
 This is a fork from the [original `sharedb-postgres`](https://github.com/share/sharedb-postgres) and its relative forks (see [billwashere](https://github.com/billwashere/sharedb-postgres-jsonb), [zbryikt](https://github.com/zbryikt/sharedb-postgres-jsonb). It seems to have been not maintained for a long time since 2018, Thus we decide to fork it and maintain it as `@plotdb/sharedb-postgre`.
 
 
+## Installation 
+
+```cmd
+npm i @plotdb/sharedb-postgres
+```
+
+
 ## Requirements
 
 Due to the fix to resolve [high concurency issues](https://github.com/share/sharedb-postgres/issues/1) Postgres 9.5+ is now required.
@@ -42,7 +49,7 @@ PostgreSQL configuration as an argument or use environmental arguments.
 For example using environmental arugments:
 
 ```js
-var db = require('sharedb-postgres')();
+var db = require('@plotdb/sharedb-postgres')();
 var backend = require('sharedb')({db: db})
 ```
 
@@ -55,7 +62,7 @@ PGUSER=dbuser  PGPASSWORD=secretpassword PGHOST=database.server.com PGDATABASE=m
 Example using an object
 
 ```js
-var db = require('sharedb-postgres')({host: 'localhost', database: 'mydb'});
+var db = require('@plotdb/sharedb-postgres')({host: 'localhost', database: 'mydb'});
 var backend = require('sharedb')({db: db})
 ```
 
diff --git a/package-lock.json b/package-lock.json
index 7232016..6f0a273 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,8 +1,233 @@
 {
   "name": "@plotdb/sharedb-postgres",
-  "version": "4.0.0",
-  "lockfileVersion": 1,
+  "version": "4.0.1",
+  "lockfileVersion": 2,
   "requires": true,
+  "packages": {
+    "": {
+      "name": "@plotdb/sharedb-postgres",
+      "version": "4.0.0",
+      "license": "MIT",
+      "dependencies": {
+        "pg": "^8.5.1",
+        "pg-pool": "^3.2.1",
+        "sharedb": "^1.6.0"
+      }
+    },
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+      "dependencies": {
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+        "pg-protocol": "^1.4.0",
+        "pg-types": "^2.1.0",
+        "pgpass": "1.x"
+      },
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+        "postgres-array": "~2.0.0",
+        "postgres-bytea": "~1.0.0",
+        "postgres-date": "~1.0.4",
+        "postgres-interval": "^1.1.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
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+      "dependencies": {
+        "split2": "^3.1.1"
+      }
+    },
+    "node_modules/postgres-array": {
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+      "resolved": "https://registry.npmjs.org/postgres-array/-/postgres-array-2.0.0.tgz",
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+      },
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+      }
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+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
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+      "resolved": "https://registry.npmjs.org/sharedb/-/sharedb-1.6.0.tgz",
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+        "arraydiff": "^0.1.1",
+        "async": "^2.6.3",
+        "fast-deep-equal": "^2.0.1",
+        "hat": "0.0.3",
+        "ot-json0": "^1.0.1"
+      }
+    },
+    "node_modules/split2": {
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+      }
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+    "node_modules/string_decoder": {
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+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
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+      "dependencies": {
+        "safe-buffer": "~5.2.0"
+      }
+    },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
+    },
+    "node_modules/xtend": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
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+      "engines": {
+        "node": ">=0.4"
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+  },
   "dependencies": {
     "arraydiff": {
       "version": "0.1.3",
@@ -152,9 +377,9 @@
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     },
     "sharedb": {
-      "version": "1.3.4",
-      "resolved": "https://registry.npmjs.org/sharedb/-/sharedb-1.3.4.tgz",
-      "integrity": "sha512-tHiqFmd07cdbWavooUtGN7VGZdiQXrIhKPTSC2X5B8xHHpdss9NOO3kVvp3rYktb6PDiQteyRl40r10rDAHwHw==",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/sharedb/-/sharedb-1.6.0.tgz",
+      "integrity": "sha512-N6jhmh408OrZQA7V9Eb1R1vfnJe4zoBjB932L/Z2U4jBZ1F8VTHneMntgVmDfjqkAIWN16TVpxMbcycuLxcDpQ==",
       "requires": {
         "arraydiff": "^0.1.1",
         "async": "^2.6.3",
diff --git a/package.json b/package.json
index 3c21f6d..051bc07 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@plotdb/sharedb-postgres",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "PostgreSQL adapter for ShareDB. forked from share/sharedb-postgres",
   "main": "index.js",
   "scripts": {
@@ -14,10 +14,13 @@
     "share",
     "postgres"
   ],
-  "repository": "share/sharedb-postgres",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/plotdb/sharedb-postgres"
+  },
   "dependencies": {
     "pg": "^8.5.1",
     "pg-pool": "^3.2.1",
-    "sharedb": "^1.0.0"
+    "sharedb": "^1.6.0"
   }
 }