diff --git a/public/index.html b/public/index.html
index f65e15e..95ebc6e 100644
--- a/public/index.html
+++ b/public/index.html
@@ -20,7 +20,7 @@
     <meta property="og:image:height" content="400" />
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
-    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/latest/css/bootstrap.min.css" crossorigin="anonymous">
+    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
     <link rel="manifest" href="%PUBLIC_URL%/manifest.json">
     <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
     <!--