diff --git a/packages/extension_google_sign_in_as_googleapis_auth/example/lib/main.dart b/packages/extension_google_sign_in_as_googleapis_auth/example/lib/main.dart
index 12f1fd66ec..6fe6120671 100755
--- a/packages/extension_google_sign_in_as_googleapis_auth/example/lib/main.dart
+++ b/packages/extension_google_sign_in_as_googleapis_auth/example/lib/main.dart
@@ -34,13 +34,13 @@ class SignInDemo extends StatefulWidget {
 
 /// The state of the main widget.
 class SignInDemoState extends State<SignInDemo> {
-  GoogleSignInAccount _currentUser;
-  String _contactText;
+  GoogleSignInAccount? _currentUser;
+  String? _contactText;
 
   @override
   void initState() {
     super.initState();
-    _googleSignIn.onCurrentUserChanged.listen((GoogleSignInAccount account) {
+    _googleSignIn.onCurrentUserChanged.listen((GoogleSignInAccount? account) {
       setState(() {
         _currentUser = account;
       });
@@ -57,14 +57,14 @@ class SignInDemoState extends State<SignInDemo> {
     });
 
     final PeopleServiceApi peopleApi =
-        PeopleServiceApi(await _googleSignIn.authenticatedClient());
+        PeopleServiceApi((await _googleSignIn.authenticatedClient())!);
     final ListConnectionsResponse response =
         await peopleApi.people.connections.list(
       'people/me',
       personFields: 'names',
     );
 
-    final String firstNamedContactName =
+    final String? firstNamedContactName =
         _pickFirstNamedContact(response.connections);
 
     setState(() {
@@ -76,18 +76,16 @@ class SignInDemoState extends State<SignInDemo> {
     });
   }
 
-  String _pickFirstNamedContact(List<Person> connections) {
+  String? _pickFirstNamedContact(List<Person>? connections) {
     return connections
         ?.firstWhere(
           (Person person) => person.names != null,
-          orElse: () => null,
         )
-        ?.names
+        .names
         ?.firstWhere(
           (Name name) => name.displayName != null,
-          orElse: () => null,
         )
-        ?.displayName;
+        .displayName;
   }
 
   Future<void> _handleSignIn() async {
@@ -107,10 +105,10 @@ class SignInDemoState extends State<SignInDemo> {
         children: <Widget>[
           ListTile(
             leading: GoogleUserCircleAvatar(
-              identity: _currentUser,
+              identity: _currentUser!,
             ),
-            title: Text(_currentUser.displayName ?? ''),
-            subtitle: Text(_currentUser.email ?? ''),
+            title: Text(_currentUser!.displayName ?? ''),
+            subtitle: Text(_currentUser!.email),
           ),
           const Text('Signed in successfully.'),
           Text(_contactText ?? ''),
diff --git a/packages/extension_google_sign_in_as_googleapis_auth/example/pubspec.yaml b/packages/extension_google_sign_in_as_googleapis_auth/example/pubspec.yaml
index bc9070ac04..b5ed9a12c6 100755
--- a/packages/extension_google_sign_in_as_googleapis_auth/example/pubspec.yaml
+++ b/packages/extension_google_sign_in_as_googleapis_auth/example/pubspec.yaml
@@ -1,5 +1,6 @@
 name: extension_google_sign_in_example
 description: Example of Google Sign-In plugin and googleapis.
+publish_to: none
 
 dependencies:
   extension_google_sign_in_as_googleapis_auth:
@@ -12,7 +13,7 @@ dependencies:
   flutter:
     sdk: flutter
   google_sign_in: ^5.0.0
-  googleapis: ^1.0.0
+  googleapis: ^2.0.0
 
 dev_dependencies:
   pedantic: ^1.10.0
@@ -21,5 +22,5 @@ flutter:
   uses-material-design: true
 
 environment:
-  sdk: ">=2.0.0-dev.28.0 <3.0.0"
-  flutter: ">=1.12.13+hotfix.4"
+  sdk: ">=2.12.0 <3.0.0"
+  flutter: ">=1.20.0"