diff --git a/_layouts/course.html b/_layouts/course.html
index 71eda52..4c47092 100644
--- a/_layouts/course.html
+++ b/_layouts/course.html
@@ -13,16 +13,14 @@
     <![endif]-->
 
     <!-- Google tag (gtag.js) -->
-        <script>
-            (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-             (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-             m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-             })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
-            
-            ga('create', 'UA-42646483-1', 'hua-zhou.github.io');
-            ga('send', 'pageview');
-            
-        </script>
+    <script async src="https://www.googletagmanager.com/gtag/js?id=UA-42646483-1"></script>
+    <script>
+      window.dataLayer = window.dataLayer || [];
+      function gtag(){dataLayer.push(arguments);}
+      gtag('js', new Date());
+    
+      gtag('config', 'UA-42646483-1');
+    </script>
         
   </head>
   
diff --git a/_layouts/default.html b/_layouts/default.html
index e19b7ee..ffb9b6b 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -13,16 +13,15 @@
     <![endif]-->
 
     <!-- Google tag (gtag.js) -->
-        <script>
-            (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-             (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-             m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-             })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
-            
-            ga('create', 'UA-42646483-1', 'hua-zhou.github.io');
-            ga('send', 'pageview');
-            
-        </script>
+    <!-- Google tag (gtag.js) -->
+    <script async src="https://www.googletagmanager.com/gtag/js?id=UA-42646483-1"></script>
+    <script>
+      window.dataLayer = window.dataLayer || [];
+      function gtag(){dataLayer.push(arguments);}
+      gtag('js', new Date());
+    
+      gtag('config', 'UA-42646483-1');
+    </script>
 
   </head>
   
diff --git a/_layouts/post_teaching.html b/_layouts/post_teaching.html
index 5845283..fdae20c 100644
--- a/_layouts/post_teaching.html
+++ b/_layouts/post_teaching.html
@@ -12,17 +12,15 @@
     <script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
     <![endif]-->
 
-        <!-- Google tag (gtag.js) -->
-        <script>
-            (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-             (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-             m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-             })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
-            
-            ga('create', 'UA-42646483-1', 'hua-zhou.github.io');
-            ga('send', 'pageview');
-            
-        </script>
+    <!-- Google tag (gtag.js) -->
+    <script async src="https://www.googletagmanager.com/gtag/js?id=UA-42646483-1"></script>
+    <script>
+      window.dataLayer = window.dataLayer || [];
+      function gtag(){dataLayer.push(arguments);}
+      gtag('js', new Date());
+    
+      gtag('config', 'UA-42646483-1');
+    </script>
 
 		<script type="text/x-mathjax-config">
 			MathJax.Hub.Config({