diff --git a/pages/_document.js b/pages/_document.js
index cd953ee..da64c7a 100644
--- a/pages/_document.js
+++ b/pages/_document.js
@@ -49,6 +49,20 @@ class MyDocument extends Document {
             name="viewport"
             content="width=device-width, initial-scale=1.0"
           />
+          <script
+            async
+            src="https://www.googletagmanager.com/gtag/js?id=G-4QRG14GXW2"
+          ></script>
+          <script
+            dangerouslySetInnerHTML={{
+              __html: `
+                window.dataLayer = window.dataLayer || [];
+                function gtag(){dataLayer.push(arguments);}
+                gtag('js', new Date());
+                gtag('config', 'G-4QRG14GXW2');
+              `,
+            }}
+          ></script>
         </Head>
         <body>
           <Main />
