diff --git a/README.md b/README.md
index 8795ecc..7b50209 100644
--- a/README.md
+++ b/README.md
@@ -531,7 +531,7 @@ This package requires Promise support, therefore you will need to polyfill if yo
 **The browser-ready bundle is only 18 KB when minified and 6 KB when gzipped**.
 
 ```html
-<script src="https://polyfill.io/v3/polyfill.min.js?features=Promise"></script>
+<script src="https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?features=Promise"></script>
 <script src="https://unpkg.com/axe"></script>
 <script type="text/javascript">
   (function () {
@@ -548,10 +548,10 @@ This package requires Promise support, therefore you will need to polyfill if yo
 
 #### Required Browser Features
 
-We recommend using <https://polyfill.io> (specifically with the bundle mentioned in [VanillaJS](#vanillajs) above):
+We recommend using <https://cdnjs.cloudflare.com/polyfill> (specifically with the bundle mentioned in [VanillaJS](#vanillajs) above):
 
 ```html
-<script src="https://polyfill.io/v3/polyfill.min.js?features=Promise"></script>
+<script src="https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?features=Promise"></script>
 ```
 
 * Promise is not supported in op\_mini all
diff --git a/index.html b/index.html
index cd83af1..eea1a55 100644
--- a/index.html
+++ b/index.html
@@ -14,7 +14,7 @@
 <body>
   <div id="app">
   </div>
-  <script src="https://polyfill.io/v3/polyfill.min.js?features=Promise"></script>
+  <script src="https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?features=Promise"></script>
   <script src="dist/axe.js"></script>
   <script type="text/javascript">
     (function() {
