diff --git a/index.html b/index.html
index 5abe28a..0675970 100644
--- a/index.html
+++ b/index.html
@@ -750,10 +750,12 @@
 				{ src: 'plugin/zoom-js/zoom.js', async: true },
 				{ src: 'plugin/notes/notes.js', async: true },
 
-				{ src: '//cdn.socket.io/socket.io-1.3.5.js', async: true },
-				{ src: 'plugin/multiplex/master.js', async: true },
-				// and if you want speaker notes
-				{ src: 'plugin/notes-server/client.js', async: true }
+				{ src: 'https://cdn.socket.io/socket.io-2.0.3.js', async: true },
+				{
+					src: Reveal.getQueryHash().s ?
+						'plugin/multiplex/master.js' :
+						'plugin/notes-server/client.js', async: true
+				},
 			]
 		});
 	</script>