diff --git a/sample/web/index.html b/sample/web/index.html
index e678a23..cfc9ebb 100644
--- a/sample/web/index.html
+++ b/sample/web/index.html
@@ -32,29 +32,11 @@
   <title>sample</title>
   <link rel="manifest" href="manifest.json">
 
-  <script>
-    // The value below is injected by flutter build, do not touch.
-    var serviceWorkerVersion = null;
-  </script>
   <!-- This script adds the flutter initialization JS code -->
   <script src="flutter.js" defer></script>
   <script src="https://cdn.auth0.com/js/auth0-spa-js/2.0/auth0-spa-js.production.js" defer></script>
 </head>
 <body>
-  <script>
-    window.addEventListener('load', function(ev) {
-      // Download main.dart.js
-      _flutter.loader.loadEntrypoint({
-        serviceWorker: {
-          serviceWorkerVersion: serviceWorkerVersion,
-        },
-        onEntrypointLoaded: function(engineInitializer) {
-          engineInitializer.initializeEngine().then(function(appRunner) {
-            appRunner.runApp();
-          });
-        }
-      });
-    });
-  </script>
+  <script src="flutter_bootstrap.js" async></script>
 </body>
 </html>
