diff --git a/index.js b/index.js
index 16b0bc9..1868dca 100644
--- a/index.js
+++ b/index.js
@@ -191,6 +191,6 @@ function close (fastify, done) {
 }
 
 module.exports = fp(fastifyWebsocket, {
-  fastify: '>= 3.11.0',
+  fastify: '>= 4.0.0',
   name: '@fastify/websocket'
 })
diff --git a/package.json b/package.json
index 7fc3621..af1e82f 100644
--- a/package.json
+++ b/package.json
@@ -28,8 +28,9 @@
     "@fastify/pre-commit": "^2.0.2",
     "@fastify/type-provider-typebox": "^2.3.0",
     "@sinclair/typebox": "^0.25.10",
+    "@types/node": "^18.15.0",
     "@types/ws": "^8.2.2",
-    "fastify": "^4.0.0-rc.2",
+    "fastify": "^4.0.0",
     "split2": "^4.1.0",
     "standard": "^17.0.0",
     "tap": "^16.0.0",