diff --git a/index.html b/index.html
index 155f169e..863ee369 100644
--- a/index.html
+++ b/index.html
@@ -10,7 +10,7 @@
 
     <!-- IEのfetch API対応 -->
     <script src="https://cdnjs.cloudflare.com/ajax/libs/es6-promise/3.3.1/es6-promise.min.js"></script>
-    <script src="https://cdnjs.cloudflare.com/ajax/libs/fetch/1.1.1/fetch.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/fetch/3.4.0/fetch.min.js"></script>
 
     <title>ES6のテスト</title>
 </head>