diff --git a/src/index.html b/src/index.html
index 5d2fad143..c0112322f 100644
--- a/src/index.html
+++ b/src/index.html
@@ -63,19 +63,21 @@
     </style>
   </noscript>
   <script src="https://www.google.com/recaptcha/api.js?render=6LcpTuUnAAAAAD6YCBdr_2-0b1AH8N6nXkYEG5G5"></script>
-  <!-- Google tag (gtag.js) -->
-  <script async src="https://www.googletagmanager.com/gtag/js?id=G-X07MS2584V"></script>
-  <script>
-    window.dataLayer = window.dataLayer || [];
-
-    function gtag() {
-      dataLayer.push(arguments);
-    }
-
-    gtag('js', new Date());
-
-    gtag('config', 'G-X07MS2584V');
-  </script>
+  <!-- Google Tag Manager -->
+  <script>(function (w, d, s, l, i) {
+    w[l] = w[l] || [];
+    w[l].push({
+      'gtm.start':
+        new Date().getTime(), event: 'gtm.js',
+    });
+    var f = d.getElementsByTagName(s)[0],
+      j = d.createElement(s), dl = l != 'dataLayer' ? '&l=' + l : '';
+    j.async = true;
+    j.src =
+      'https://www.googletagmanager.com/gtm.js?id=' + i + dl;
+    f.parentNode.insertBefore(j, f);
+  })(window, document, 'script', 'dataLayer', 'GTM-NT2453N');</script>
+  <!-- End Google Tag Manager -->
 </head>
 
 <body>
@@ -90,8 +92,11 @@
       >
     </p>
   </div>
+  <iframe src="https://www.googletagmanager.com/ns.html?id=GTM-NT2453N"
+          height="0" width="0" style="display:none;visibility:hidden"></iframe>
 </noscript>
 
+
 <!--items for announcement of new page, and optional skip to main content link go here (inserted by master.js)-->
 
 <div id="app-container">
@@ -153,7 +158,7 @@ <h3 id="basic-html-message">
     var progressBar = document.getElementById('loading-screen-progress');
     var message = document.getElementById('loading-screen-message');
     var progressInner = document.querySelector(
-      '#loading-screen-progress>span'
+      '#loading-screen-progress>span',
     );
     var progressValue = 0;
 
