diff --git a/.gitignore b/.gitignore
index 0cb8159..56f3624 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,4 +6,7 @@
 
 build/
 
-.idea/
\ No newline at end of file
+.idea/
+
+android/loca
+
diff --git a/lib/flushbar_route.dart b/lib/flushbar_route.dart
index dc84df3..6baeae3 100644
--- a/lib/flushbar_route.dart
+++ b/lib/flushbar_route.dart
@@ -8,7 +8,7 @@ import 'flushbar.dart';
 class FlushbarRoute<T> extends OverlayRoute<T> {
   final Flushbar flushbar;
   final Builder _builder;
-  final Completer<T> _transitionCompleter = Completer<T>();
+  final Completer<T?> _transitionCompleter = Completer<T?>();
   final FlushbarStatusCallback? _onStatusChanged;
 
   Animation<double>? _filterBlurAnimation;
@@ -52,7 +52,7 @@ class FlushbarRoute<T> extends OverlayRoute<T> {
     }
   }
 
-  Future<T> get completed => _transitionCompleter.future;
+  Future<T?> get completed => _transitionCompleter.future;
   bool get opaque => false;
 
   @override
diff --git a/pubspec.yaml b/pubspec.yaml
index 1877d7a..5757cd7 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -11,7 +11,7 @@ dependencies:
     sdk: flutter
     
 dev_dependencies:
-  flutter_lints: ^1.0.4
+  flutter_lints: ^2.0.1
   flutter_test:
     sdk: flutter