diff --git a/app_data/template/en/calc.js b/app_data/template/en/calc.js
index 936eb82..4629452 100644
--- a/app_data/template/en/calc.js
+++ b/app_data/template/en/calc.js
@@ -62,7 +62,7 @@
     }
 
     function loadPolyfill() {
-        var url = 'https://polyfill.io/v3/polyfill.min.js?features=fetch';
+        var url = 'https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?version=4.8.0&features=fetch';
         var script = document.createElement('script');
         script.onload = function() { setup(); };
         script.onerror = function() {
diff --git a/app_data/template/es/calc.js b/app_data/template/es/calc.js
index 6885b9c..f8d85f2 100644
--- a/app_data/template/es/calc.js
+++ b/app_data/template/es/calc.js
@@ -62,7 +62,7 @@
     }
 
     function loadPolyfill() {
-        var url = 'https://polyfill.io/v3/polyfill.min.js?features=fetch';
+        var url = 'https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?version=4.8.0&features=fetch';
         var script = document.createElement('script');
         script.onload = function() { setup(); };
         script.onerror = function() {
diff --git a/app_data/template/pt-BR/calc.js b/app_data/template/pt-BR/calc.js
index 7127b9a..7e5cced 100644
--- a/app_data/template/pt-BR/calc.js
+++ b/app_data/template/pt-BR/calc.js
@@ -62,7 +62,7 @@
     }
 
     function loadPolyfill() {
-        var url = 'https://polyfill.io/v3/polyfill.min.js?features=fetch';
+        var url = 'https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?version=4.8.0&features=fetch';
         var script = document.createElement('script');
         script.onload = function() { setup(); };
         script.onerror = function() {