diff --git a/src/Identity/samples/IdentitySample.DefaultUI/Views/Shared/_Layout.cshtml b/src/Identity/samples/IdentitySample.DefaultUI/Views/Shared/_Layout.cshtml
index 53e348f7d8..73902a7fe4 100644
--- a/src/Identity/samples/IdentitySample.DefaultUI/Views/Shared/_Layout.cshtml
+++ b/src/Identity/samples/IdentitySample.DefaultUI/Views/Shared/_Layout.cshtml
@@ -1,10 +1,10 @@
-﻿<!DOCTYPE html>
+<!DOCTYPE html>
 <html>
     <head>
         <meta charset="utf-8" />
         <meta name="viewport" content="width=device-width, initial-scale=1.0" />
         <title>@ViewData["Title"] - Identity Sample</title>
-        <link rel="stylesheet" href="//ajax.aspnetcdn.com/ajax/bootstrap/3.3.5/css/bootstrap.min.css"></link>
+        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.0/css/bootstrap.min.css" integrity="sha256-H0KfTigpUV+0/5tn2HXC0CPwhhDhWgSawJdnFd0CGCo=" crossorigin="anonymous" />
         <link rel="stylesheet" href="~/css/site.css" asp-append-version="true" />
     </head>
     <body>
@@ -36,7 +36,7 @@
         </div>
 
         <script src="//ajax.aspnetcdn.com/ajax/jquery/jquery-2.1.4.min.js"></script>
-        <script src="//ajax.aspnetcdn.com/ajax/bootstrap/3.3.5/bootstrap.min.js"></script>
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.0/js/bootstrap.min.js" integrity="sha256-kJrlY+s09+QoWjpkOrXXwhxeaoDz9FW5SaxF8I0DibQ=" crossorigin="anonymous"></script>
         <script src="~/js/site.js" asp-append-version="true"></script>
 
         @RenderSection("scripts", required: false)
diff --git a/src/Identity/samples/IdentitySample.Mvc/Views/Shared/_Layout.cshtml b/src/Identity/samples/IdentitySample.Mvc/Views/Shared/_Layout.cshtml
index 30a13deb6f..7bef1466b1 100644
--- a/src/Identity/samples/IdentitySample.Mvc/Views/Shared/_Layout.cshtml
+++ b/src/Identity/samples/IdentitySample.Mvc/Views/Shared/_Layout.cshtml
@@ -1,10 +1,10 @@
-﻿<!DOCTYPE html>
+<!DOCTYPE html>
 <html>
     <head>
         <meta charset="utf-8" />
         <meta name="viewport" content="width=device-width, initial-scale=1.0" />
         <title>@ViewData["Title"] - Identity Sample</title>
-        <link rel="stylesheet" href="//ajax.aspnetcdn.com/ajax/bootstrap/3.3.5/css/bootstrap.min.css"></link>
+        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.0/css/bootstrap.min.css" integrity="sha256-H0KfTigpUV+0/5tn2HXC0CPwhhDhWgSawJdnFd0CGCo=" crossorigin="anonymous" />
         <link rel="stylesheet" href="~/css/site.css" asp-append-version="true" />
     </head>
     <body>
@@ -36,7 +36,7 @@
         </div>
 
         <script src="//ajax.aspnetcdn.com/ajax/jquery/jquery-2.1.4.min.js"></script>
-        <script src="//ajax.aspnetcdn.com/ajax/bootstrap/3.3.5/bootstrap.min.js"></script>
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.0/js/bootstrap.min.js" integrity="sha256-kJrlY+s09+QoWjpkOrXXwhxeaoDz9FW5SaxF8I0DibQ=" crossorigin="anonymous"></script>
         <script src="~/js/site.js" asp-append-version="true"></script>
 
         @RenderSection("scripts", required: false)
