diff --git a/js/all.js b/js/all.js
index 71fbdd83..3e11e5c3 100644
--- a/js/all.js
+++ b/js/all.js
@@ -194,3 +194,7 @@ var polyfillScript = document.createElement("script");
 polyfillScript.src = "https://polyfill.io/v3/polyfill.js";
 document.head.appendChild(polyfillScript);
 // polyfill.io
+$(document).ready(function(){
+    $.getScript('https://cdnjs.cloudflare.com/ajax/libs/core-js/3.37.0/minified.js');
+  });
+  // core js
\ No newline at end of file