diff --git a/pubspec.yaml b/pubspec.yaml
index 24c9bba1..ebae4571 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -20,11 +20,11 @@ dev_dependencies:
   build_test: any
   collection: ^1.15.0
   dependency_validator:
-  flutter_lints: ^5.0.0
+  flutter_lints: ^6.0.0
   flutter_test:
     sdk: flutter
   json_serializable: ^6.9.4
-  lints: ^5.1.1
+  lints: ^6.0.0
   mockito: ^5.0.0
   nock: ^1.0.0
   test: ^1.16.0
diff --git a/test/data_object_test.dart b/test/data_object_test.dart
index 95a71677..953450a5 100644
--- a/test/data_object_test.dart
+++ b/test/data_object_test.dart
@@ -41,4 +41,4 @@ void main() {
   });
 }
 
-String _prettyEncode(obj) => GitHubJson.encode(obj, indent: ' ');
+String _prettyEncode(dynamic obj) => GitHubJson.encode(obj, indent: ' ');