diff --git a/example/lib/main.dart b/example/lib/main.dart
index a336f13..b6cb94e 100644
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@@ -1,7 +1,5 @@
 import 'package:flutter/material.dart';
-import 'dart:async';
 
-import 'package:flutter/services.dart';
 import 'package:make_app_endless_plugin/make_app_endless_plugin.dart';
 
 void main() {
@@ -33,7 +31,7 @@ class _MyAppState extends State<MyApp> {
             child: Column(
                 mainAxisAlignment: MainAxisAlignment.center,
                 children: <Widget>[
-              RaisedButton(
+              ElevatedButton(
                 child: const Text('Make Endless'),
                 onPressed: () async {
                   await plugin.extendLifeCycle(
@@ -43,7 +41,7 @@ class _MyAppState extends State<MyApp> {
                       "No description required"); // Notification Content description
                 },
               ),
-              RaisedButton(
+              ElevatedButton(
                 child: const Text('Stop'),
                 onPressed: () async {
                   await plugin.stopLifeCycleExtension();
diff --git a/pubspec.yaml b/pubspec.yaml
index d30ae3a..8e3eb3a 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ version: 0.0.4
 homepage: https://github.com/chetan882777/make-app-endless-plugin
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: '>=2.12.0 <3.0.0'
   flutter: ">=1.20.0 <2.0.0"
 
 dependencies:
diff --git a/test/make_app_endless_plugin_test.dart b/test/make_app_endless_plugin_test.dart
index 67a2a3d..d0ab923 100644
--- a/test/make_app_endless_plugin_test.dart
+++ b/test/make_app_endless_plugin_test.dart
@@ -1,6 +1,5 @@
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:make_app_endless_plugin/make_app_endless_plugin.dart';
 
 void main() {
   const MethodChannel channel = MethodChannel('make_app_endless_plugin');