diff --git a/examples/cluster-httpd/server/package.json b/examples/cluster-httpd/server/package.json
index 0fe83ecd3e..36a24fd28f 100644
--- a/examples/cluster-httpd/server/package.json
+++ b/examples/cluster-httpd/server/package.json
@@ -8,7 +8,7 @@
   "license": "BSD",
   "dependencies": {
     "express": "4.13.4",
-    "socket.io": "^1.7.2",
+    "socket.io": "^2.5.0",
     "socket.io-redis": "^3.0.0"
   },
   "scripts": {