diff --git a/firestore/index.html b/firestore/index.html
index 107339fc..bc24d2b8 100644
--- a/firestore/index.html
+++ b/firestore/index.html
@@ -12,8 +12,8 @@
 
   <script>mocha.setup('bdd')</script>
 
-  <script src="https://www.gstatic.com/firebasejs/8.8.1/firebase.js"></script>
-  <script src="https://www.gstatic.com/firebasejs/8.8.1/firebase-firestore.js"></script>
+  <script src="https://www.gstatic.com/firebasejs/8.9.1/firebase.js"></script>
+  <script src="https://www.gstatic.com/firebasejs/8.9.1/firebase-firestore.js"></script>
   <script src="test.firestore.js"></script>
   <script src="test.solution-arrays.js"></script>
   <script src="test.solution-counters.js"></script>
diff --git a/messaging/service-worker.js b/messaging/service-worker.js
index 65f0aa01..9b768ff4 100644
--- a/messaging/service-worker.js
+++ b/messaging/service-worker.js
@@ -10,8 +10,8 @@ function initInSw() {
   // Give the service worker access to Firebase Messaging.
   // Note that you can only use Firebase Messaging here. Other Firebase libraries
   // are not available in the service worker.
-  importScripts('https://www.gstatic.com/firebasejs/8.8.1/firebase-app.js');
-  importScripts('https://www.gstatic.com/firebasejs/8.8.1/firebase-messaging.js');
+  importScripts('https://www.gstatic.com/firebasejs/8.9.1/firebase-app.js');
+  importScripts('https://www.gstatic.com/firebasejs/8.9.1/firebase-messaging.js');
 
   // Initialize the Firebase app in the service worker by passing in
   // your app's Firebase config object.