diff --git a/bin/callback.js b/bin/callback.cjs
similarity index 86%
rename from bin/callback.js
rename to bin/callback.cjs
index 4da8163..418f7c3 100644
--- a/bin/callback.js
+++ b/bin/callback.cjs
@@ -1,7 +1,8 @@
 const http = require('http')
+const number = require('lib0/number')
 
 const CALLBACK_URL = process.env.CALLBACK_URL ? new URL(process.env.CALLBACK_URL) : null
-const CALLBACK_TIMEOUT = process.env.CALLBACK_TIMEOUT || 5000
+const CALLBACK_TIMEOUT = number.parseInt(process.env.CALLBACK_TIMEOUT || '5000')
 const CALLBACK_OBJECTS = process.env.CALLBACK_OBJECTS ? JSON.parse(process.env.CALLBACK_OBJECTS) : {}
 
 exports.isCallbackSet = !!CALLBACK_URL
@@ -9,7 +10,7 @@ exports.isCallbackSet = !!CALLBACK_URL
 /**
  * @param {Uint8Array} update
  * @param {any} origin
- * @param {WSSharedDoc} doc
+ * @param {import('./utils.cjs').WSSharedDoc} doc
  */
 exports.callbackHandler = (update, origin, doc) => {
   const room = doc.name
@@ -25,7 +26,7 @@ exports.callbackHandler = (update, origin, doc) => {
       content: getContent(sharedObjectName, sharedObjectType, doc).toJSON()
     }
   })
-  callbackRequest(CALLBACK_URL, CALLBACK_TIMEOUT, dataToSend)
+  CALLBACK_URL && callbackRequest(CALLBACK_URL, CALLBACK_TIMEOUT, dataToSend)
 }
 
 /**
@@ -62,7 +63,7 @@ const callbackRequest = (url, timeout, data) => {
 /**
  * @param {string} objName
  * @param {string} objType
- * @param {WSSharedDoc} doc
+ * @param {import('./utils.cjs').WSSharedDoc} doc
  */
 const getContent = (objName, objType, doc) => {
   switch (objType) {
diff --git a/bin/server.js b/bin/server.cjs
similarity index 77%
rename from bin/server.js
rename to bin/server.cjs
index 839633f..751aaf1 100755
--- a/bin/server.js
+++ b/bin/server.cjs
@@ -5,13 +5,14 @@
  */
 const WebSocket = require('ws')
 const http = require('http')
+const number = require('lib0/number')
 const wss = new WebSocket.Server({ noServer: true })
-const setupWSConnection = require('./utils.js').setupWSConnection
+const setupWSConnection = require('./utils.cjs').setupWSConnection
 
 const host = process.env.HOST || 'localhost'
-const port = process.env.PORT || 1234
+const port = number.parseInt(process.env.PORT || '1234')
 
-const server = http.createServer((request, response) => {
+const server = http.createServer((_request, response) => {
   response.writeHead(200, { 'Content-Type': 'text/plain' })
   response.end('okay')
 })
diff --git a/bin/utils.js b/bin/utils.cjs
similarity index 93%
rename from bin/utils.js
rename to bin/utils.cjs
index 72775d9..91b003f 100644
--- a/bin/utils.js
+++ b/bin/utils.cjs
@@ -1,18 +1,18 @@
 const Y = require('yjs')
-const syncProtocol = require('y-protocols/dist/sync.cjs')
-const awarenessProtocol = require('y-protocols/dist/awareness.cjs')
+const syncProtocol = require('y-protocols/sync')
+const awarenessProtocol = require('y-protocols/awareness')
 
-const encoding = require('lib0/dist/encoding.cjs')
-const decoding = require('lib0/dist/decoding.cjs')
-const map = require('lib0/dist/map.cjs')
+const encoding = require('lib0/encoding')
+const decoding = require('lib0/decoding')
+const map = require('lib0/map')
 
 const debounce = require('lodash.debounce')
 
-const callbackHandler = require('./callback.js').callbackHandler
-const isCallbackSet = require('./callback.js').isCallbackSet
+const callbackHandler = require('./callback.cjs').callbackHandler
+const isCallbackSet = require('./callback.cjs').isCallbackSet
 
-const CALLBACK_DEBOUNCE_WAIT = parseInt(process.env.CALLBACK_DEBOUNCE_WAIT) || 2000
-const CALLBACK_DEBOUNCE_MAXWAIT = parseInt(process.env.CALLBACK_DEBOUNCE_MAXWAIT) || 10000
+const CALLBACK_DEBOUNCE_WAIT = parseInt(process.env.CALLBACK_DEBOUNCE_WAIT || '2000')
+const CALLBACK_DEBOUNCE_MAXWAIT = parseInt(process.env.CALLBACK_DEBOUNCE_MAXWAIT || '10000')
 
 const wsReadyStateConnecting = 0
 const wsReadyStateOpen = 1
@@ -73,10 +73,11 @@ const messageAwareness = 1
 
 /**
  * @param {Uint8Array} update
- * @param {any} origin
+ * @param {any} _origin
  * @param {WSSharedDoc} doc
+ * @param {any} _tr
  */
-const updateHandler = (update, origin, doc) => {
+const updateHandler = (update, _origin, doc, _tr) => {
   const encoder = encoding.createEncoder()
   encoding.writeVarUint(encoder, messageSync)
   syncProtocol.writeUpdate(encoder, update)
@@ -124,7 +125,7 @@ class WSSharedDoc extends Y.Doc {
       })
     }
     this.awareness.on('update', awarenessChangeHandler)
-    this.on('update', updateHandler)
+    this.on('update', /** @type {any} */ (updateHandler))
     if (isCallbackSet) {
       this.on('update', debounce(
         callbackHandler,
@@ -135,6 +136,8 @@ class WSSharedDoc extends Y.Doc {
   }
 }
 
+exports.WSSharedDoc = WSSharedDoc
+
 /**
  * Gets a Y.Doc by name, whether in memory or on disk
  *
@@ -183,6 +186,7 @@ const messageListener = (conn, doc, message) => {
     }
   } catch (err) {
     console.error(err)
+    // @ts-ignore
     doc.emit('error', [err])
   }
 }
diff --git a/package-lock.json b/package-lock.json
index a6f9f76..fac9886 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,8 +14,8 @@
         "y-protocols": "^1.0.5"
       },
       "bin": {
-        "y-websocket": "bin/server.js",
-        "y-websocket-server": "bin/server.js"
+        "y-websocket": "bin/server.cjs",
+        "y-websocket-server": "bin/server.cjs"
       },
       "devDependencies": {
         "@types/node": "^18.15.0",
@@ -24,6 +24,10 @@
         "typescript": "^4.9.5",
         "yjs": "^13.5.0"
       },
+      "engines": {
+        "node": ">=16.0.0",
+        "npm": ">=8.0.0"
+      },
       "funding": {
         "type": "GitHub Sponsors ❤",
         "url": "https://github.com/sponsors/dmonad"
@@ -1915,17 +1919,19 @@
       }
     },
     "node_modules/lib0": {
-      "version": "0.2.66",
-      "resolved": "https://registry.npmjs.org/lib0/-/lib0-0.2.66.tgz",
-      "integrity": "sha512-h63Jt0nmFGmE4aXMPHUuRBpDgkdr1gfeVn+epJJ8m6+gPK0AozP6akJ8rp9IqBP8RC/peLi+pwaOx/qpgAvqgA==",
+      "version": "0.2.93",
+      "resolved": "https://registry.npmjs.org/lib0/-/lib0-0.2.93.tgz",
+      "integrity": "sha512-M5IKsiFJYulS+8Eal8f+zAqf5ckm1vffW0fFDxfgxJ+uiVopvDdd3PxJmz0GsVi3YNO7QCFSq0nAsiDmNhLj9Q==",
       "dependencies": {
         "isomorphic.js": "^0.2.4"
       },
       "bin": {
-        "0gentesthtml": "bin/gentesthtml.js"
+        "0ecdsa-generate-keypair": "bin/0ecdsa-generate-keypair.js",
+        "0gentesthtml": "bin/gentesthtml.js",
+        "0serve": "bin/0serve.js"
       },
       "engines": {
-        "node": ">=14"
+        "node": ">=16"
       },
       "funding": {
         "type": "GitHub Sponsors ❤",
@@ -3152,12 +3158,16 @@
       }
     },
     "node_modules/yjs": {
-      "version": "13.5.50",
-      "resolved": "https://registry.npmjs.org/yjs/-/yjs-13.5.50.tgz",
-      "integrity": "sha512-Q2KVNfovwjtJV4Yxz+HaFYT6vTYBaFagOSpTL3jbPc7Sbv/My68fLTfPlYy9FmNO87pV8dMBd5XuVar+9WsAWg==",
+      "version": "13.6.14",
+      "resolved": "https://registry.npmjs.org/yjs/-/yjs-13.6.14.tgz",
+      "integrity": "sha512-D+7KcUr0j+vBCUSKXXEWfA+bG4UQBviAwP3gYBhkstkgwy5+8diOPMx0iqLIOxNo/HxaREUimZRxqHGAHCL2BQ==",
       "devOptional": true,
       "dependencies": {
-        "lib0": "^0.2.49"
+        "lib0": "^0.2.86"
+      },
+      "engines": {
+        "node": ">=16.0.0",
+        "npm": ">=8.0.0"
       },
       "funding": {
         "type": "GitHub Sponsors ❤",
diff --git a/package.json b/package.json
index 441d8e2..7fd7a65 100644
--- a/package.json
+++ b/package.json
@@ -5,21 +5,22 @@
   "main": "./dist/y-websocket.cjs",
   "module": "./src/y-websocket.js",
   "types": "./dist/src/y-websocket.d.ts",
+  "type": "module",
   "sideEffects": false,
   "funding": {
     "type": "GitHub Sponsors ❤",
     "url": "https://github.com/sponsors/dmonad"
   },
   "scripts": {
-    "start": "node ./bin/server.js",
+    "start": "node ./bin/server.cjs",
     "dist": "rm -rf dist && rollup -c && tsc",
     "lint": "standard && tsc",
     "test": "npm run lint",
     "preversion": "npm run lint && npm run dist && test -e dist/src/y-websocket.d.ts && test -e dist/y-websocket.cjs"
   },
   "bin": {
-    "y-websocket-server": "./bin/server.js",
-    "y-websocket": "./bin/server.js"
+    "y-websocket-server": "./bin/server.cjs",
+    "y-websocket": "./bin/server.cjs"
   },
   "files": [
     "dist/*",
@@ -28,13 +29,14 @@
   ],
   "exports": {
     "./package.json": "./package.json",
-    "./bin/utils": "./bin/utils.js",
-    "./bin/callback": "./bin/callback.js",
+    "./bin/utils": "./bin/utils.cjs",
+    "./bin/callback": "./bin/callback.cjs",
     ".": {
       "module": "./src/y-websocket.js",
       "import": "./src/y-websocket.js",
       "require": "./dist/y-websocket.cjs",
-      "types": "./dist/src/y-websocket.d.ts"
+      "types": "./dist/src/y-websocket.d.ts",
+      "default": "./dist/y-websocket.js"
     }
   },
   "repository": {
diff --git a/tsconfig.json b/tsconfig.json
index f263390..e15dee3 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -58,5 +58,5 @@
     // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
     // "maxNodeModuleJsDepth": 5
   },
-  "include": ["./src/y-websocket.js"]
+  "include": ["./src/y-websocket.js", "./bin/**/*"]
 }