diff --git a/index.html b/index.html
index 2e44ef17..4b421652 100644
--- a/index.html
+++ b/index.html
@@ -17,6 +17,16 @@
   <!-- google webmaster -->
   <meta name="google-site-verification" content="pyo9N70ZWyh8JB43bIu633mhxesJ1IcwWCZlM3jUfFo" />
   
+  <!-- Google tag (gtag.js) -->
+  <script async src="https://www.googletagmanager.com/gtag/js?id=G-8DP4GX97XY"></script>
+  <script>
+    window.dataLayer = window.dataLayer || [];
+    function gtag(){dataLayer.push(arguments);}
+    gtag('js', new Date());
+
+    gtag('config', 'G-8DP4GX97XY');
+  </script>
+
   <link rel="stylesheet" href="asset/dark-mode.css">
   <script src="asset/dark-mode.js"></script>
   <link rel="stylesheet" href="asset/share.css">