diff --git a/src/index.html b/src/index.html
index cdb5d103..ba75722a 100644
--- a/src/index.html
+++ b/src/index.html
@@ -42,8 +42,10 @@
 
     <script src="https://js.stripe.com/v2/"></script>
     <!-- @if true !>
-    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" />
-    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" />
+    <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="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css"
+          integrity="sha384-wvfXpqpZZVQGK6TAh5PVlGOfQNHSoD2xbE+QkPxCAFlNEevoEH3Sl0sibVcOQVnN" crossorigin="anonymous">
     <meta name="x-stylesheet-test" content="" class="fa invisible" />
     <script src="js/fallback-styles.min.js?v=<!-- @echo cacheTag !>"></script>
 
@@ -62,9 +64,12 @@
     <div ui-view></div>
 
     <!-- @if true !>
-    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
-    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
-    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.3/angular.min.js"></script>
+    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"
+            integrity="sha384-rY/jv8mMhqDabXSo+UCggqKtdmBfd3qC2/KvyTDNQ6PcUJXaxK1tMepoQda4g5vB" crossorigin="anonymous"></script>
+    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"
+            integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
+    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.3/angular.min.js"
+            integrity="sha384-AH/e+s4V4kUifvnNED2x1XZqArO5qTFU4YKRzUXbz4IgPG1H0Xmz6fP1XUmO4vT/" crossorigin="anonymous"></script>
     <script src="js/fallback-scripts.min.js?v=<!-- @echo cacheTag !>"></script>
 
     <script src="js/lib.min.js?v=<!-- @echo cacheTag !>"></script>