diff --git a/addins/CFSample/customfunctions.html b/addins/CFSample/customfunctions.html
index d883a40..298651a 100644
--- a/addins/CFSample/customfunctions.html
+++ b/addins/CFSample/customfunctions.html
@@ -6,7 +6,7 @@
         <meta http-equiv="Expires" content="0" />
         <title>Custom Functions</title>
 
-        <script src="https://appsforoffice.microsoft.com/lib/preview/hosted/custom-functions-runtime.debug.js" type="text/javascript"></script>
+        <script src="https://appsforoffice.microsoft.com/lib/beta/hosted/custom-functions-runtime.debug.js" type="text/javascript"></script>
 
         <script type="text/javascript">
             // Private functions