diff --git a/samples/playground.html.njk b/samples/playground.html.njk
index 5057235dbb..079c333fbf 100644
--- a/samples/playground.html.njk
+++ b/samples/playground.html.njk
@@ -7,7 +7,7 @@ preconnect:
   - fonts.googleapis.com
   - khms0.googleapis.com
   - khms1.googleapis.com
-  - polyfill.io
+  - cdnjs.cloudflare.com
 ---
 <!DOCTYPE html>
 <html lang="en">
@@ -38,4 +38,4 @@ preconnect:
   </head>
   <body>
   </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/src/_includes/layout.njk b/src/_includes/layout.njk
index 705443c3a7..35e9e8105e 100644
--- a/src/_includes/layout.njk
+++ b/src/_includes/layout.njk
@@ -9,7 +9,7 @@
 <html {% if rtl == "true" %}dir="rtl"{% endif -%}>
   <head>
   <title>{{ title }}</title>
-  {% block polyfill -%}<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>{% endblock -%}
+  {% block polyfill -%}<script src="https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?features=default"></script>{% endblock -%}
   {% block external -%}{% endblock -%}
   {% if mode == "playground" %}
     <!-- playground-hide -->
@@ -52,4 +52,4 @@
   {% endblock %}   
   </body>
 </html>
-<!-- [END maps_{{tag}}] -->
\ No newline at end of file
+<!-- [END maps_{{tag}}] -->
