diff --git a/example/lib/main.dart b/example/lib/main.dart
index 5a73a60..6e33696 100644
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@@ -1,17 +1,17 @@
 import 'package:flutter/material.dart';
 import 'package:gradient_app_bar/gradient_app_bar.dart';
 
-void main() => runApp(new MyApp());
+void main() => runApp(MyApp());
 
 class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    return new MaterialApp(
+    return MaterialApp(
       title: 'Flutter Demo',
-      theme: new ThemeData(
+      theme: ThemeData(
         primarySwatch: Colors.blue,
       ),
-      home: new MyHomePage(title: 'Flutter Demo Home Page'),
+      home: MyHomePage(title: 'Flutter Demo Home Page'),
     );
   }
 }
@@ -22,7 +22,7 @@ class MyHomePage extends StatefulWidget {
   final String title;
 
   @override
-  _MyHomePageState createState() => new _MyHomePageState();
+  _MyHomePageState createState() => _MyHomePageState();
 }
 
 class _MyHomePageState extends State<MyHomePage> {
@@ -38,11 +38,10 @@ class _MyHomePageState extends State<MyHomePage> {
   Widget build(BuildContext context) {
     return DefaultTabController(
       length: 2,
-      child: new Scaffold(
-        appBar: new GradientAppBar(
-          title: new Text(widget.title),
-          backgroundColorStart: Colors.blue,
-          backgroundColorEnd: Colors.red,
+      child: Scaffold(
+        appBar: GradientAppBar(
+          title: Text(widget.title),
+          gradient: LinearGradient(colors: [Colors.red, Colors.purple]),
           bottom: TabBar(tabs: <Widget>[
             Tab(
               icon: Icon(Icons.home),
@@ -54,24 +53,24 @@ class _MyHomePageState extends State<MyHomePage> {
             )
           ]),
         ),
-        body: new Center(
-          child: new Column(
+        body: Center(
+          child: Column(
             mainAxisAlignment: MainAxisAlignment.center,
             children: <Widget>[
-              new Text(
+              Text(
                 'You have pushed the button this many times:',
               ),
-              new Text(
+              Text(
                 '$_counter',
                 style: Theme.of(context).textTheme.display1,
               ),
             ],
           ),
         ),
-        floatingActionButton: new FloatingActionButton(
+        floatingActionButton: FloatingActionButton(
           onPressed: _incrementCounter,
           tooltip: 'Increment',
-          child: new Icon(Icons.add),
+          child: Icon(Icons.add),
           backgroundColor: Colors.red,
         ),
       ),
diff --git a/example/pubspec.lock b/example/pubspec.lock
index da90d33..3ecb8d0 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -1,5 +1,5 @@
 # Generated by pub
-# See https://www.dartlang.org/tools/pub/glossary#lockfile
+# See https://dart.dev/tools/pub/glossary#lockfile
 packages:
   async:
     dependency: transitive
@@ -7,7 +7,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.8"
+    version: "2.2.0"
   boolean_selector:
     dependency: transitive
     description:
@@ -52,14 +52,14 @@ packages:
       name: gradient_app_bar
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.1"
+    version: "0.1.0"
   matcher:
     dependency: transitive
     description:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.3+1"
+    version: "0.12.5"
   meta:
     dependency: transitive
     description:
@@ -80,14 +80,14 @@ packages:
       name: pedantic
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.4.0"
+    version: "1.7.0"
   quiver:
     dependency: transitive
     description:
       name: quiver
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.1"
+    version: "2.0.3"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -99,7 +99,7 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.5.4"
+    version: "1.5.5"
   stack_trace:
     dependency: transitive
     description:
@@ -113,7 +113,7 @@ packages:
       name: stream_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.8"
+    version: "2.0.0"
   string_scanner:
     dependency: transitive
     description:
@@ -134,7 +134,7 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.2"
+    version: "0.2.5"
   typed_data:
     dependency: transitive
     description:
@@ -150,4 +150,4 @@ packages:
     source: hosted
     version: "2.0.8"
 sdks:
-  dart: ">=2.1.0 <3.0.0"
+  dart: ">=2.2.2 <3.0.0"
diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index 5f569cb..552b9d0 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -10,7 +10,7 @@ description: A new Flutter project.
 version: 1.0.0+1
 
 dependencies:
-  gradient_app_bar: ^0.0.1
+  gradient_app_bar: ^0.1.0
   flutter:
     sdk: flutter