diff --git a/demo.html b/demo.html
index e9a75a6..d787803 100644
--- a/demo.html
+++ b/demo.html
@@ -63,7 +63,7 @@
     </script>
     <!-- Safe extension (http://docs.mathjax.org/en/latest/safe-mode.html)
          only needed if editor content may be controlled by other users. -->
-    <script src="../MathJax/MathJax.js?config=TeX-AMS_HTML-full,Safe"></script>
+    <script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML-full,Safe"></script>
   </head>
   <body>
     <h1>attempt at CodeMirror + in-place MathJax</h1>
