diff --git a/.guides/balloons/package.json b/.guides/balloons/package.json
index a0602e5..cf2d0b4 100644
--- a/.guides/balloons/package.json
+++ b/.guides/balloons/package.json
@@ -4,6 +4,6 @@
   "description": "A little game to learn float and clear",
   "dependencies": {
     "express": "4.10.2",
-    "socket.io": "1.2.0"
+    "socket.io": "2.5.0"
   }
 }
\ No newline at end of file