diff --git a/_includes/head.html b/_includes/head.html
index 9c8a48ec5e..d8c9ba6f48 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -43,6 +43,6 @@
       }
     }
   </script>
-  <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
+  <script src="https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?features=es6"></script>
   <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
 {% endif %}