diff --git a/docs/preso/plugin/multiplex/package.json b/docs/preso/plugin/multiplex/package.json
index 53856c4c..ab5a1ff7 100644
--- a/docs/preso/plugin/multiplex/package.json
+++ b/docs/preso/plugin/multiplex/package.json
@@ -13,7 +13,7 @@
     "express": "~4.17.1",
     "grunt-cli": "~1.3.0",
     "mustache": "~2.3.2",
-    "socket.io": "~2.3.0"
+    "socket.io": "~3.0.0"
   },
   "license": "MIT"
 }