diff --git a/authenticated-json-api/public/index.html b/authenticated-json-api/public/index.html
index a9680830de..713af91805 100644
--- a/authenticated-json-api/public/index.html
+++ b/authenticated-json-api/public/index.html
@@ -98,9 +98,9 @@ <h5>Message Details</h5>
     </div>
 
     <script src="https://code.getmdl.io/1.1.3/material.min.js"></script>
-    <script src="/__/firebase/3.9.0/firebase-app.js"></script>
-    <script src="/__/firebase/3.9.0/firebase-auth.js"></script>
-    <script src="/__/firebase/3.9.0/firebase-database.js"></script>
+    <script src="/__/firebase/5.3.1/firebase-app.js"></script>
+    <script src="/__/firebase/5.3.1/firebase-auth.js"></script>
+    <script src="/__/firebase/5.3.1/firebase-database.js"></script>
     <script src="/__/firebase/init.js"></script>
     <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
     <script src="main.js"></script>
diff --git a/authorized-https-endpoint/public/index.html b/authorized-https-endpoint/public/index.html
index 17c670cd82..a79bb9ad7d 100644
--- a/authorized-https-endpoint/public/index.html
+++ b/authorized-https-endpoint/public/index.html
@@ -80,8 +80,8 @@ <h3>Authorized HTTP Function demo</h3>
 <!-- Import and configure the Firebase SDK -->
 <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
 <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
-<script src="/__/firebase/4.8.2/firebase-app.js"></script>
-<script src="/__/firebase/4.8.2/firebase-auth.js"></script>
+<script src="/__/firebase/5.3.1/firebase-app.js"></script>
+<script src="/__/firebase/5.3.1/firebase-auth.js"></script>
 <script src="/__/firebase/init.js"></script>
 
 <script src="main.js"></script>
diff --git a/email-confirmation/public/index.html b/email-confirmation/public/index.html
index 0c9168e0fa..741ad889a5 100644
--- a/email-confirmation/public/index.html
+++ b/email-confirmation/public/index.html
@@ -100,9 +100,9 @@ <h3>Very interesting website with Newsletter</h3>
 <!-- Import and configure the Firebase SDK -->
 <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
 <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
-<script src="/__/firebase/3.9.0/firebase-app.js"></script>
-<script src="/__/firebase/3.9.0/firebase-auth.js"></script>
-<script src="/__/firebase/3.9.0/firebase-database.js"></script>
+<script src="/__/firebase/5.3.1/firebase-app.js"></script>
+<script src="/__/firebase/5.3.1/firebase-auth.js"></script>
+<script src="/__/firebase/5.3.1/firebase-database.js"></script>
 <script src="/__/firebase/init.js"></script>
 
 <script src="main.js"></script>
diff --git a/exif-images/public/index.html b/exif-images/public/index.html
index 959a1a88ee..9e6f3a79cd 100644
--- a/exif-images/public/index.html
+++ b/exif-images/public/index.html
@@ -65,10 +65,10 @@ <h6>Image Metadata:</h6>
   <!-- Import and configure the Firebase SDK -->
   <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
   <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
-  <script src="/__/firebase/3.9.0/firebase-app.js"></script>
-  <script src="/__/firebase/3.9.0/firebase-auth.js"></script>
-  <script src="/__/firebase/3.9.0/firebase-storage.js"></script>
-  <script src="/__/firebase/3.9.0/firebase-database.js"></script>
+  <script src="/__/firebase/5.3.1/firebase-app.js"></script>
+  <script src="/__/firebase/5.3.1/firebase-auth.js"></script>
+  <script src="/__/firebase/5.3.1/firebase-storage.js"></script>
+  <script src="/__/firebase/5.3.1/firebase-database.js"></script>
   <script src="/__/firebase/init.js"></script>
 
   <script src="main.js"></script>
diff --git a/fcm-notifications/public/index.html b/fcm-notifications/public/index.html
index bef5bd5552..07b427f12a 100644
--- a/fcm-notifications/public/index.html
+++ b/fcm-notifications/public/index.html
@@ -86,10 +86,10 @@ <h3>Send FCM notifications demo</h3>
 <!-- Import and configure the Firebase SDK -->
 <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
 <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
-<script src="/__/firebase/3.9.0/firebase-app.js"></script>
-<script src="/__/firebase/3.9.0/firebase-auth.js"></script>
-<script src="/__/firebase/3.9.0/firebase-messaging.js"></script>
-<script src="/__/firebase/3.9.0/firebase-database.js"></script>
+<script src="/__/firebase/5.3.1/firebase-app.js"></script>
+<script src="/__/firebase/5.3.1/firebase-auth.js"></script>
+<script src="/__/firebase/5.3.1/firebase-messaging.js"></script>
+<script src="/__/firebase/5.3.1/firebase-database.js"></script>
 <script src="/__/firebase/init.js"></script>
 
 <script src="main.js"></script>
diff --git a/fulltext-search-firestore/public/index.html b/fulltext-search-firestore/public/index.html
index 5fd1000c40..cc861e1154 100644
--- a/fulltext-search-firestore/public/index.html
+++ b/fulltext-search-firestore/public/index.html
@@ -56,9 +56,9 @@ <h3>Results</h3>
         <!-- Import and configure the Firebase SDK -->
         <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
         <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
-        <script src="/__/firebase/4.5.0/firebase-app.js"></script>
-        <script src="/__/firebase/4.5.0/firebase-auth.js"></script>
-        <script src="/__/firebase/0.5.0/firebase-firestore.js"></script>
+        <script src="/__/firebase/5.3.1/firebase-app.js"></script>
+        <script src="/__/firebase/5.3.1/firebase-auth.js"></script>
+        <script src="/__/firebase/5.3.1/firebase-firestore.js"></script>
         
         <script src="/__/firebase/init.js"></script>
 
diff --git a/instagram-auth/public/index.html b/instagram-auth/public/index.html
index 98cc4f2658..cd3c952893 100644
--- a/instagram-auth/public/index.html
+++ b/instagram-auth/public/index.html
@@ -71,8 +71,8 @@ <h3>Sign in with Instagram demo</h3>
 <!-- Import and configure the Firebase SDK -->
 <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
 <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
-<script src="/__/firebase/3.9.0/firebase-app.js"></script>
-<script src="/__/firebase/3.9.0/firebase-auth.js"></script>
+<script src="/__/firebase/5.3.1/firebase-app.js"></script>
+<script src="/__/firebase/5.3.1/firebase-auth.js"></script>
 <script src="/__/firebase/init.js"></script>
 
 <script src="main.js"></script>
diff --git a/instagram-auth/public/popup.html b/instagram-auth/public/popup.html
index 7d43cf1e86..25669f0ec9 100644
--- a/instagram-auth/public/popup.html
+++ b/instagram-auth/public/popup.html
@@ -27,8 +27,8 @@
 <!-- Import and configure the Firebase SDK -->
 <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
 <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
-<script src="/__/firebase/3.9.0/firebase-app.js"></script>
-<script src="/__/firebase/3.9.0/firebase-auth.js"></script>
+<script src="/__/firebase/5.3.1/firebase-app.js"></script>
+<script src="/__/firebase/5.3.1/firebase-auth.js"></script>
 <script src="/__/firebase/init.js"></script>
 
 <script>
diff --git a/linkedin-auth/public/index.html b/linkedin-auth/public/index.html
index 1cd83652f5..2e23809532 100644
--- a/linkedin-auth/public/index.html
+++ b/linkedin-auth/public/index.html
@@ -72,8 +72,8 @@ <h3>Sign in with LinkedIn demo</h3>
 <!-- Import and configure the Firebase SDK -->
 <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
 <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
-<script src="/__/firebase/3.9.0/firebase-app.js"></script>
-<script src="/__/firebase/3.9.0/firebase-auth.js"></script>
+<script src="/__/firebase/5.3.1/firebase-app.js"></script>
+<script src="/__/firebase/5.3.1/firebase-auth.js"></script>
 <script src="/__/firebase/init.js"></script>
 
 <script src="main.js"></script>
diff --git a/linkedin-auth/public/popup.html b/linkedin-auth/public/popup.html
index a265d44bbe..e1b4e51ab7 100644
--- a/linkedin-auth/public/popup.html
+++ b/linkedin-auth/public/popup.html
@@ -27,8 +27,8 @@
 <!-- Import and configure the Firebase SDK -->
 <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
 <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
-<script src="/__/firebase/3.9.0/firebase-app.js"></script>
-<script src="/__/firebase/3.9.0/firebase-auth.js"></script>
+<script src="/__/firebase/5.3.1/firebase-app.js"></script>
+<script src="/__/firebase/5.3.1/firebase-auth.js"></script>
 <script src="/__/firebase/init.js"></script>
 
 <script>
diff --git a/paypal/public/index.html b/paypal/public/index.html
index d26ca78aa6..2a1f9f45ca 100644
--- a/paypal/public/index.html
+++ b/paypal/public/index.html
@@ -30,9 +30,9 @@
   <!-- Import and configure the Firebase SDK -->
   <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
   <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
-  <script src="/__/firebase/4.5.0/firebase-app.js"></script>
-  <script src="/__/firebase/4.5.0/firebase-auth.js"></script>
-  <script src="/__/firebase/4.5.0/firebase-database.js"></script>
+  <script src="/__/firebase/5.3.1/firebase-app.js"></script>
+  <script src="/__/firebase/5.3.1/firebase-auth.js"></script>
+  <script src="/__/firebase/5.3.1/firebase-database.js"></script>
   <script src="/__/firebase/init.js"></script>
 
   <script type="text/javascript">
diff --git a/presence-firestore/public/index.html b/presence-firestore/public/index.html
index 12df8f4fed..6366be15fc 100644
--- a/presence-firestore/public/index.html
+++ b/presence-firestore/public/index.html
@@ -23,9 +23,9 @@ <h3>History of user presence (since this page was opened)</h3>
         <!-- Import and configure the Firebase SDK -->
         <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
         <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
-        <script src="/__/firebase/4.5.0/firebase-app.js"></script>
-        <script src="/__/firebase/4.5.0/firebase-auth.js"></script>
-        <script src="/__/firebase/0.5.0/firebase-firestore.js"></script>
+        <script src="/__/firebase/5.3.1/firebase-app.js"></script>
+        <script src="/__/firebase/5.3.1/firebase-auth.js"></script>
+        <script src="/__/firebase/5.3.1/firebase-firestore.js"></script>
         
         <script src="/__/firebase/init.js"></script>
 
diff --git a/quickstarts/big-ben/public/index.html b/quickstarts/big-ben/public/index.html
index 6137ee5168..915ca93d2c 100644
--- a/quickstarts/big-ben/public/index.html
+++ b/quickstarts/big-ben/public/index.html
@@ -6,12 +6,12 @@
     <title>Welcome to Firebase Hosting</title>
 
     <!-- update the version number as needed -->
-    <script defer src="/__/firebase/4.8.0/firebase-app.js"></script>
+    <script defer src="/__/firebase/5.3.1/firebase-app.js"></script>
     <!-- include only the Firebase features as you need -->
-    <script defer src="/__/firebase/4.8.0/firebase-auth.js"></script>
-    <script defer src="/__/firebase/4.8.0/firebase-database.js"></script>
-    <script defer src="/__/firebase/4.8.0/firebase-messaging.js"></script>
-    <script defer src="/__/firebase/4.8.0/firebase-storage.js"></script>
+    <script defer src="/__/firebase/5.3.1/firebase-auth.js"></script>
+    <script defer src="/__/firebase/5.3.1/firebase-database.js"></script>
+    <script defer src="/__/firebase/5.3.1/firebase-messaging.js"></script>
+    <script defer src="/__/firebase/5.3.1/firebase-storage.js"></script>
     <!-- initialize the SDK after all desired features are loaded -->
     <script defer src="/__/firebase/init.js"></script>
 
diff --git a/quickstarts/email-users/public/index.html b/quickstarts/email-users/public/index.html
index c7b336112c..486cc64965 100644
--- a/quickstarts/email-users/public/index.html
+++ b/quickstarts/email-users/public/index.html
@@ -68,9 +68,9 @@ <h3>Welcome email demo</h3>
 </div>
 
 <!-- Firebase -->
-<script defer src="/__/firebase/4.8.0/firebase-app.js"></script>
-<script defer src="/__/firebase/4.8.0/firebase-auth.js"></script>
-<script defer src="/__/firebase/4.8.0/firebase-database.js"></script>
+<script defer src="/__/firebase/5.3.1/firebase-app.js"></script>
+<script defer src="/__/firebase/5.3.1/firebase-auth.js"></script>
+<script defer src="/__/firebase/5.3.1/firebase-database.js"></script>
 <!-- initialize the SDK after all desired features are loaded -->
 <script defer src="/__/firebase/init.js"></script>
 
diff --git a/spotify-auth/public/index.html b/spotify-auth/public/index.html
index 366f35df8a..0e9d67dfa8 100644
--- a/spotify-auth/public/index.html
+++ b/spotify-auth/public/index.html
@@ -69,8 +69,8 @@ <h3>Sign in with Spotify demo</h3>
 </div>
 
 <!-- Firebase -->
-<script src="/__/firebase/4.5.0/firebase-app.js"></script>
-<script src="/__/firebase/4.5.0/firebase-auth.js"></script>
+<script src="/__/firebase/5.3.1/firebase-app.js"></script>
+<script src="/__/firebase/5.3.1/firebase-auth.js"></script>
 <script src="/__/firebase/init.js"></script>
 
 <script src="main.js"></script>
diff --git a/spotify-auth/public/popup.html b/spotify-auth/public/popup.html
index 99c7671226..5494e26299 100644
--- a/spotify-auth/public/popup.html
+++ b/spotify-auth/public/popup.html
@@ -24,8 +24,8 @@
 Please wait...
 
 <!-- Firebase -->
-<script src="/__/firebase/4.5.0/firebase-app.js"></script>
-<script src="/__/firebase/4.5.0/firebase-auth.js"></script>
+<script src="/__/firebase/5.3.1/firebase-app.js"></script>
+<script src="/__/firebase/5.3.1/firebase-auth.js"></script>
 <script src="/__/firebase/init.js"></script>
 
 <script>
diff --git a/stripe/public/index.html b/stripe/public/index.html
index d760741779..a8d65c136a 100644
--- a/stripe/public/index.html
+++ b/stripe/public/index.html
@@ -5,7 +5,7 @@
     <title>Cloud Functions for Firebase (Stripe example)</title>
     <script src="https://js.stripe.com/v2/"></script>
     <script src="https://unpkg.com/vue/dist/vue.js"></script>
-    <link rel="stylesheet" href="https://cdn.firebase.com/libs/firebaseui/1.0.0/firebaseui.css" />
+    <link rel="stylesheet" href="https://cdn.firebase.com/libs/firebaseui/3.3.0/firebaseui.css" />
   </head>
   <body>
     <div class="container">
@@ -101,13 +101,13 @@ <h4>New</h4>
     <!-- Import and configure the Firebase SDK -->
     <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
     <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
-    <script src="/__/firebase/4.2.0/firebase-app.js"></script>
-    <script src="/__/firebase/4.2.0/firebase-auth.js"></script>
-    <script src="/__/firebase/4.2.0/firebase-database.js"></script>
+    <script src="/__/firebase/5.3.1/firebase-app.js"></script>
+    <script src="/__/firebase/5.3.1/firebase-auth.js"></script>
+    <script src="/__/firebase/5.3.1/firebase-database.js"></script>
     <script src="/__/firebase/init.js"></script>
 
     <!-- Import Firebase UI -->
-    <script src="https://cdn.firebase.com/libs/firebaseui/1.0.0/firebaseui.js"></script>
+    <script src="https://cdn.firebase.com/libs/firebaseui/3.3.0/firebaseui.js"></script>
 
     <script>
       Stripe.setPublishableKey( /* TODO: add your stripe publishable key */ );
diff --git a/text-moderation/public/index.html b/text-moderation/public/index.html
index 197fb30d55..ef55e1e475 100644
--- a/text-moderation/public/index.html
+++ b/text-moderation/public/index.html
@@ -94,8 +94,8 @@ <h2 class="mdl-card__title-text">Last Guestbook's messages</h2>
 <!-- Import and configure the Firebase SDK -->
 <!-- These scripts are made available when the app is served or deployed on Firebase Hosting -->
 <!-- If you do not serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup -->
-<script src="/__/firebase/3.9.0/firebase-app.js"></script>
-<script src="/__/firebase/3.9.0/firebase-database.js"></script>
+<script src="/__/firebase/5.3.1/firebase-app.js"></script>
+<script src="/__/firebase/5.3.1/firebase-database.js"></script>
 <script src="/__/firebase/init.js"></script>
 
 <script src="main.js"></script>