diff --git a/example/templates/index.html b/example/templates/index.html
index a51921e..f4e3b1d 100644
--- a/example/templates/index.html
+++ b/example/templates/index.html
@@ -7,7 +7,7 @@
 
 {% block scripts %}
 {{ super() }}
-<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.6/socket.io.min.js"></script>
+<script type="text/javascript" src="//cdn.socket.io/4.7.5/socket.io.min.js"></script>
 <script type="text/javascript" charset="utf-8">
   $(document).ready(function() {
     var socket = io.connect('http://' + document.domain + ':' + location.port);