diff --git a/example/lib/domain/dtos/register_param_dto.dart b/example/lib/domain/dtos/register_param_dto.dart
index 2382c3e..ccbb5ef 100644
--- a/example/lib/domain/dtos/register_param_dto.dart
+++ b/example/lib/domain/dtos/register_param_dto.dart
@@ -1,23 +1,45 @@
-class RegisterParamDto {
-  String email;
-  String phone;
-  String password;
-  String confirmPassword;
+import 'package:flutter/material.dart';
+
+class RegisterParamDto extends ChangeNotifier {
+  String _email;
+  String _phone;
+  String _password;
+  String _confirmPassword;
+
+  String get email => _email;
+  String get phone => _phone;
+  String get password => _password;
+  String get confirmPassword => _confirmPassword;
 
   RegisterParamDto({
-    required this.email,
-    required this.phone,
-    required this.password,
-    required this.confirmPassword,
-  });
+    required String email,
+    required String phone,
+    required String password,
+    required String confirmPassword,
+  })  : _email = email,
+        _phone = phone,
+        _password = password,
+        _confirmPassword = confirmPassword;
 
   factory RegisterParamDto.empty() => RegisterParamDto(email: '', password: '', phone: '', confirmPassword: '');
 
-  setEmail(String value) => email = value;
+  void setEmail(String value) {
+    _email = value;
+    notifyListeners();
+  }
 
-  setPassword(String value) => password = value;
+  void setPassword(String value) {
+    _password = value;
+    notifyListeners();
+  }
 
-  setConfirmPassword(String value) => confirmPassword = value;
+  void setConfirmPassword(String value) {
+    _confirmPassword = value;
+    notifyListeners();
+  }
 
-  setPhone(String value) => phone = value;
+  void setPhone(String value) {
+    _phone = value;
+    notifyListeners();
+  }
 }
diff --git a/example/lib/presentation/register_page/register_page.dart b/example/lib/presentation/register_page/register_page.dart
index 86f6c80..1fcaa5f 100644
--- a/example/lib/presentation/register_page/register_page.dart
+++ b/example/lib/presentation/register_page/register_page.dart
@@ -101,16 +101,23 @@ class _RegisterPageState extends State<RegisterPage> {
               ),
             ),
             const SizedBox(height: 12),
-            ElevatedButton(
-              onPressed: signIn,
-              child: const Text('Sign up'),
+            ListenableBuilder(
+              listenable: registerParamDto,
+              builder: (context, child) {
+                final errors = validator.validate(registerParamDto);
+
+                return ElevatedButton(
+                  onPressed: errors.isEmpty ? signIn : null,
+                  child: const Text('Register'),
+                );
+              },
             ),
             const SizedBox(height: 12),
             ElevatedButton(
               onPressed: () {
                 Navigator.pop(context);
               },
-              child: const Text('Sign In'),
+              child: const Text('Back'),
             ),
             const Spacer(),
           ],
diff --git a/example/pubspec.lock b/example/pubspec.lock
index 5be00a7..c1ef826 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -79,18 +79,18 @@ packages:
     dependency: transitive
     description:
       name: leak_tracker
-      sha256: "3f87a60e8c63aecc975dda1ceedbc8f24de75f09e4856ea27daf8958f2f0ce05"
+      sha256: "7f0df31977cb2c0b88585095d168e689669a2cc9b97c309665e3386f3e9d341a"
       url: "https://pub.dev"
     source: hosted
-    version: "10.0.5"
+    version: "10.0.4"
   leak_tracker_flutter_testing:
     dependency: transitive
     description:
       name: leak_tracker_flutter_testing
-      sha256: "932549fb305594d82d7183ecd9fa93463e9914e1b67cacc34bc40906594a1806"
+      sha256: "06e98f569d004c1315b991ded39924b21af84cf14cc94791b8aea337d25b57f8"
       url: "https://pub.dev"
     source: hosted
-    version: "3.0.5"
+    version: "3.0.3"
   leak_tracker_testing:
     dependency: transitive
     description:
@@ -113,7 +113,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.0.1"
+    version: "0.0.5"
   matcher:
     dependency: transitive
     description:
@@ -126,18 +126,18 @@ packages:
     dependency: transitive
     description:
       name: material_color_utilities
-      sha256: f7142bb1154231d7ea5f96bc7bde4bda2a0945d2806bb11670e30b850d56bdec
+      sha256: "0e0a020085b65b6083975e499759762399b4475f766c21668c4ecca34ea74e5a"
       url: "https://pub.dev"
     source: hosted
-    version: "0.11.1"
+    version: "0.8.0"
   meta:
     dependency: transitive
     description:
       name: meta
-      sha256: bdb68674043280c3428e9ec998512fb681678676b3c54e773629ffe74419f8c7
+      sha256: "7687075e408b093f36e6bbf6c91878cc0d4cd10f409506f7bc996f68220b9136"
       url: "https://pub.dev"
     source: hosted
-    version: "1.15.0"
+    version: "1.12.0"
   path:
     dependency: transitive
     description:
@@ -195,10 +195,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: "5b8a98dafc4d5c4c9c72d8b31ab2b23fc13422348d2997120294d3bac86b4ddb"
+      sha256: "9955ae474176f7ac8ee4e989dadfb411a58c30415bcfb648fa04b2b8a03afa7f"
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.2"
+    version: "0.7.0"
   vector_math:
     dependency: transitive
     description:
@@ -211,10 +211,10 @@ packages:
     dependency: transitive
     description:
       name: vm_service
-      sha256: f652077d0bdf60abe4c1f6377448e8655008eef28f128bc023f7b5e8dfeb48fc
+      sha256: "3923c89304b715fb1eb6423f017651664a03bf5f4b29983627c4da791f74a4ec"
       url: "https://pub.dev"
     source: hosted
-    version: "14.2.4"
+    version: "14.2.1"
 sdks:
   dart: ">=3.4.3 <4.0.0"
   flutter: ">=3.18.0-18.0.pre.54"
diff --git a/example/test/widget_test.dart b/example/test/widget_test.dart
deleted file mode 100644
index 092d222..0000000
--- a/example/test/widget_test.dart
+++ /dev/null
@@ -1,30 +0,0 @@
-// This is a basic Flutter widget test.
-//
-// To perform an interaction with a widget in your test, use the WidgetTester
-// utility in the flutter_test package. For example, you can send tap and scroll
-// gestures. You can also use WidgetTester to find child widgets in the widget
-// tree, read text, and verify that the values of widget properties are correct.
-
-import 'package:flutter/material.dart';
-import 'package:flutter_test/flutter_test.dart';
-
-import 'package:example/main.dart';
-
-void main() {
-  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
-    // Build our app and trigger a frame.
-    await tester.pumpWidget(const MyApp());
-
-    // Verify that our counter starts at 0.
-    expect(find.text('0'), findsOneWidget);
-    expect(find.text('1'), findsNothing);
-
-    // Tap the '+' icon and trigger a frame.
-    await tester.tap(find.byIcon(Icons.add));
-    await tester.pump();
-
-    // Verify that our counter has incremented.
-    expect(find.text('0'), findsNothing);
-    expect(find.text('1'), findsOneWidget);
-  });
-}