diff --git a/.gitignore b/.gitignore
index 14c7d4c..b8508f5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,7 +3,10 @@
 .idea
 .packages
 .pub/
+.dart_tool/
 build/
 ios/.generated/
 packages
 pubspec.lock
+example/.flutter-plugins-dependencies
+example/ios/Flutter/flutter_export_environment.sh
diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index 91bd273..0822f38 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -1,6 +1,9 @@
 name: screen_example
 description: Demonstrates how to use the screen plugin.
 
+environment:
+  sdk: '>=2.10.0 <3.0.0'
+
 dependencies:
   flutter:
     sdk: flutter
diff --git a/lib/screen.dart b/lib/screen.dart
index 4dbc0d1..f4f406e 100644
--- a/lib/screen.dart
+++ b/lib/screen.dart
@@ -5,8 +5,8 @@ import 'package:flutter/services.dart';
 class Screen {
   static const MethodChannel _channel = const MethodChannel('github.com/clovisnicolas/flutter_screen');
 
-  static Future<double> get brightness async => (await _channel.invokeMethod('brightness')) as double;
+  static Future<double?> get brightness async => (await _channel.invokeMethod('brightness')) as double?;
   static Future setBrightness(double brightness) =>_channel.invokeMethod('setBrightness',{"brightness" : brightness});
-  static Future<bool> get isKeptOn async => (await _channel.invokeMethod('isKeptOn')) as bool;
+  static Future<bool?> get isKeptOn async => (await _channel.invokeMethod('isKeptOn')) as bool?;
   static Future keepOn(bool on) => _channel.invokeMethod('keepOn', {"on" : on});
 }
diff --git a/pubspec.yaml b/pubspec.yaml
index c3531d0..bfb8680 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,11 +1,11 @@
 name: screen
 description: A Flutter plugin to manage the device's screen on Android and iOS.
-version: 0.0.5
+version: 1.0.5
 author: Clovis Nicolas <clovisnicolas0@gmail.com>
 homepage: https://github.com/clovisnicolas/flutter_screen
 
 environment:
-  sdk: '>=2.0.0 <3.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   flutter: