diff --git a/examples/aiohttp/app.html b/examples/aiohttp/app.html
index 1668814..1012bea 100755
--- a/examples/aiohttp/app.html
+++ b/examples/aiohttp/app.html
@@ -3,7 +3,7 @@
 <head>
     <title>Flask-SocketIO Test</title>
     <script type="text/javascript" src="//code.jquery.com/jquery-2.1.4.min.js"></script>
-    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.5/socket.io.min.js"></script>
+    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.4/socket.io.slim.js"></script>
     <script type="text/javascript" charset="utf-8">
         $(document).ready(function(){
             namespace = '/test';
diff --git a/examples/aiohttp/latency.html b/examples/aiohttp/latency.html
index 769e9ef..b238cd1 100755
--- a/examples/aiohttp/latency.html
+++ b/examples/aiohttp/latency.html
@@ -11,7 +11,7 @@
 
     <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.js"></script>
     <script src="//cdnjs.cloudflare.com/ajax/libs/smoothie/1.27.0/smoothie.js"></script>
-    <script src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.6/socket.io.min.js"></script>
+    <script src="//cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.4/socket.io.slim.js"></script>
     <script>
       // socket
       var socket = io.connect('http://' + document.domain + ':' + location.port);
diff --git a/examples/sanic/app.html b/examples/sanic/app.html
index 1668814..1012bea 100755
--- a/examples/sanic/app.html
+++ b/examples/sanic/app.html
@@ -3,7 +3,7 @@
 <head>
     <title>Flask-SocketIO Test</title>
     <script type="text/javascript" src="//code.jquery.com/jquery-2.1.4.min.js"></script>
-    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.5/socket.io.min.js"></script>
+    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.4/socket.io.slim.js"></script>
     <script type="text/javascript" charset="utf-8">
         $(document).ready(function(){
             namespace = '/test';
diff --git a/examples/sanic/latency.html b/examples/sanic/latency.html
index 769e9ef..b238cd1 100755
--- a/examples/sanic/latency.html
+++ b/examples/sanic/latency.html
@@ -11,7 +11,7 @@
 
     <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.js"></script>
     <script src="//cdnjs.cloudflare.com/ajax/libs/smoothie/1.27.0/smoothie.js"></script>
-    <script src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.6/socket.io.min.js"></script>
+    <script src="//cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.4/socket.io.slim.js"></script>
     <script>
       // socket
       var socket = io.connect('http://' + document.domain + ':' + location.port);
diff --git a/examples/wsgi/django_example/socketio_app/static/index.html b/examples/wsgi/django_example/socketio_app/static/index.html
index 0e02a82..e83d5fe 100644
--- a/examples/wsgi/django_example/socketio_app/static/index.html
+++ b/examples/wsgi/django_example/socketio_app/static/index.html
@@ -3,7 +3,7 @@
 <head>
     <title>Django + SocketIO Test</title>
     <script type="text/javascript" src="//code.jquery.com/jquery-3.2.1.slim.min.js"></script>
-    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.1/socket.io.slim.js"></script>
+    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.4/socket.io.slim.js"></script>
     <script type="text/javascript" charset="utf-8">
         $(document).ready(function(){
             namespace = '/test';
diff --git a/examples/wsgi/templates/index.html b/examples/wsgi/templates/index.html
index 1668814..1012bea 100755
--- a/examples/wsgi/templates/index.html
+++ b/examples/wsgi/templates/index.html
@@ -3,7 +3,7 @@
 <head>
     <title>Flask-SocketIO Test</title>
     <script type="text/javascript" src="//code.jquery.com/jquery-2.1.4.min.js"></script>
-    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.5/socket.io.min.js"></script>
+    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.4/socket.io.slim.js"></script>
     <script type="text/javascript" charset="utf-8">
         $(document).ready(function(){
             namespace = '/test';
diff --git a/examples/wsgi/templates/latency.html b/examples/wsgi/templates/latency.html
index f77aeb3..56b8c0a 100755
--- a/examples/wsgi/templates/latency.html
+++ b/examples/wsgi/templates/latency.html
@@ -11,7 +11,7 @@
 
     <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.js"></script>
     <script src="//cdnjs.cloudflare.com/ajax/libs/smoothie/1.27.0/smoothie.js"></script>
-    <script src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.6/socket.io.min.js"></script>
+    <script src="//cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.4/socket.io.slim.js"></script>
     <script>
       // socket
       var socket = io.connect('http://' + document.domain + ':' + location.port);
