diff --git a/lib/src/formatters/cert_nascimento_input_formatter.dart b/lib/src/formatters/cert_nascimento_input_formatter.dart
index 31dcf77..e84fe2f 100644
--- a/lib/src/formatters/cert_nascimento_input_formatter.dart
+++ b/lib/src/formatters/cert_nascimento_input_formatter.dart
@@ -3,7 +3,8 @@ import 'package:flutter/services.dart';
 /// Formata o valor do campo com a mascara de Certidão de Nascimento: `XXXXXX XX XX XXXX X XXXXX XXX XXXXXXX XX`
 class CertNascimentoInputFormatter extends TextInputFormatter {
   @override
-  TextEditingValue formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue) {
+  TextEditingValue formatEditUpdate(
+      TextEditingValue oldValue, TextEditingValue newValue) {
     // verifica o tamanho máximo do campo
     if (newValue.text.length > 32) return oldValue;
 
diff --git a/pubspec.lock b/pubspec.lock
index d1116e9..576f024 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -58,10 +58,10 @@ packages:
     dependency: "direct dev"
     description:
       name: flutter_lints
-      sha256: "9e8c3858111da373efc5aa341de011d9bd23e2c5c5e0c62bccf32438e192d7b1"
+      sha256: "3f41d009ba7172d5ff9be5f6e6e6abb4300e263aab8866d2a0842ed2a70f8f0c"
       url: "https://pub.dev"
     source: hosted
-    version: "3.0.2"
+    version: "4.0.0"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -103,10 +103,10 @@ packages:
     dependency: transitive
     description:
       name: lints
-      sha256: cbf8d4b858bb0134ef3ef87841abdf8d63bfc255c266b7bf6b39daa1085c4290
+      sha256: "976c774dd944a42e83e2467f4cc670daef7eed6295b10b36ae8c85bcbf828235"
       url: "https://pub.dev"
     source: hosted
-    version: "3.0.0"
+    version: "4.0.0"
   matcher:
     dependency: transitive
     description:
diff --git a/pubspec.yaml b/pubspec.yaml
index b1f306c..7ca162b 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -14,7 +14,7 @@ dependencies:
   intl: ^0.19.0
 
 dev_dependencies:
-  flutter_lints: ^3.0.0
+  flutter_lints: ^4.0.0
   flutter_test:
     sdk: flutter
 
diff --git a/test/brasil_fields_test.dart b/test/brasil_fields_test.dart
index d011500..cda4944 100644
--- a/test/brasil_fields_test.dart
+++ b/test/brasil_fields_test.dart
@@ -175,12 +175,14 @@ void main() {
 
   testWidgets('CertNascimentoFormatter', (WidgetTester tester) async {
     final textController = TextEditingController();
-    await tester.pumpWidget(boilerplate(CertNascimentoInputFormatter(), textController));
+    await tester.pumpWidget(
+        boilerplate(CertNascimentoInputFormatter(), textController));
 
-    await tester.enterText(find.byType(TextField), '11111122334444566666777888888899');
+    await tester.enterText(
+        find.byType(TextField), '11111122334444566666777888888899');
     expect(textController.text, '111111 22 33 4444 5 66666 777 8888888 99');
   });
-    
+
   testWidgets('HoraInputFormatter', (WidgetTester tester) async {
     final textController = TextEditingController();
     await tester.pumpWidget(boilerplate(HoraInputFormatter(), textController));