diff --git a/example/06-system/03-websocket/02-chat/package.json b/example/06-system/03-websocket/02-chat/package.json
index 7b95764..ec0e21d 100644
--- a/example/06-system/03-websocket/02-chat/package.json
+++ b/example/06-system/03-websocket/02-chat/package.json
@@ -7,7 +7,7 @@
   "private": true,
   "license": "BSD",
   "dependencies": {
-    "express": "4.13.4",
+    "express": "4.19.2",
     "koa": "^2.5.3",
     "koa-static": "^5.0.0",
     "socket.io": "^2.1.1"