diff --git a/index.html b/index.html
index 20e3cc5..a67dcec 100644
--- a/index.html
+++ b/index.html
@@ -74,8 +74,8 @@
     />
 
     <!-- polyfill.io only loads a Promise polyfill if your browser needs one -->
-    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=Promise"></script>
-
+    <!-- polyfill deleted due to security concern-->
+     
     <!-- Latest version of Preview SDK for your locale -->
     <script src="https://cdn01.boxcdn.net/platform/preview/2.83.0/en-US/preview.js"></script>
     <link