diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0728902
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,15 @@
+.flutter-plugins
+.flutter-plugins-dependencies
+.dart_tool/package_config.json
+.dart_tool/package_config_subset
+.dart_tool/version
+android/local.properties
+android/local.properties
+android/local.properties
+ios/Flutter/Generated.xcconfig
+ios/Runner/GeneratedPluginRegistrant.h
+ios/Runner/GeneratedPluginRegistrant.m
+ios/Flutter/flutter_export_environment.sh
+android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java
+android/local.properties
+.packages
diff --git a/lib/picker.dart b/lib/picker.dart
index bd6919d..b619784 100644
--- a/lib/picker.dart
+++ b/lib/picker.dart
@@ -41,12 +41,11 @@ class Picker {
   ///
   /// In Android, the MainActivity can be destroyed for various reasons. If that happens, the result will be lost
   /// in this call. You can then call [retrieveLostData] when your app relaunches to retrieve the lost data.
-  static Future<File> pickImage(
-      {@required ImageSource source,
-      double maxWidth,
-      double maxHeight,
-      int imageQuality}) async {
-    assert(source != null);
+  static Future<File?> pickImage(
+      {required ImageSource source,
+      double? maxWidth,
+      double? maxHeight,
+      int? imageQuality}) async {
     assert(imageQuality == null || (imageQuality >= 0 && imageQuality <= 100));
 
     if (maxWidth != null && maxWidth < 0) {
@@ -57,7 +56,7 @@ class Picker {
       throw ArgumentError.value(maxHeight, 'maxHeight cannot be negative');
     }
 
-    final String path = await _channel.invokeMethod<String>(
+    final String? path = await _channel.invokeMethod<String>(
       'pickImage',
       <String, dynamic>{
         'source': source.index,
@@ -77,11 +76,10 @@ class Picker {
   ///
   /// In Android, the MainActivity can be destroyed for various fo reasons. If that happens, the result will be lost
   /// in this call. You can then call [retrieveLostData] when your app relaunches to retrieve the lost data.
-  static Future<File> pickVideo({
-    @required ImageSource source,
+  static Future<File?> pickVideo({
+    required ImageSource source,
   }) async {
-    assert(source != null);
-    final String path = await _channel.invokeMethod<String>(
+    final String? path = await _channel.invokeMethod<String>(
       'pickVideo',
       <String, dynamic>{
         'source': source.index,
@@ -91,17 +89,15 @@ class Picker {
   }
 
   static Future<String> saveFile(
-      {@required Uint8List fileData, String title, String description}) async {
-    assert(fileData != null);
-
-    String filePath = await _channel.invokeMethod(
+      {required Uint8List fileData, String? title, String? description}) async {
+    String filePath = (await _channel.invokeMethod(
       'saveFile',
       <String, dynamic>{
         'fileData': fileData,
         'title': title,
         'description': description
       },
-    );
+    ))!;
     debugPrint("saved filePath:" + filePath);
     //process ios return filePath
     if (filePath.startsWith("file://")) {
@@ -124,30 +120,30 @@ class Picker {
   /// * [LostDataResponse], for what's included in the response.
   /// * [Android Activity Lifecycle](https://developer.android.com/reference/android/app/Activity.html), for more information on MainActivity destruction.
   static Future<LostDataResponse> retrieveLostData() async {
-    final Map<String, dynamic> result =
+    final Map<String, dynamic>? result =
         await _channel.invokeMapMethod<String, dynamic>('retrieve');
     if (result == null) {
       return LostDataResponse.empty();
     }
     assert(result.containsKey('path') ^ result.containsKey('errorCode'));
 
-    final String type = result['type'];
+    final String? type = result['type'];
     assert(type == kTypeImage || type == kTypeVideo);
 
-    RetrieveType retrieveType;
+    RetrieveType? retrieveType;
     if (type == kTypeImage) {
       retrieveType = RetrieveType.image;
     } else if (type == kTypeVideo) {
       retrieveType = RetrieveType.video;
     }
 
-    PlatformException exception;
+    PlatformException? exception;
     if (result.containsKey('errorCode')) {
       exception = PlatformException(
           code: result['errorCode'], message: result['errorMessage']);
     }
 
-    final String path = result['path'];
+    final String? path = result['path'];
 
     return LostDataResponse(
         file: path == null ? null : File(path),
@@ -182,7 +178,7 @@ class LostDataResponse {
   /// The file that was lost in a previous [pickImage] or [pickVideo] call due to MainActivity being destroyed.
   ///
   /// Can be null if [exception] exists.
-  final File file;
+  final File? file;
 
   /// The exception of the last [pickImage] or [pickVideo].
   ///
@@ -191,10 +187,10 @@ class LostDataResponse {
   /// You should handle this exception as if the [pickImage] or [pickVideo] got an exception when the MainActivity was not destroyed.
   ///
   /// Note that it is not the exception that caused the destruction of the MainActivity.
-  final PlatformException exception;
+  final PlatformException? exception;
 
   /// Can either be [RetrieveType.image] or [RetrieveType.video];
-  final RetrieveType type;
+  final RetrieveType? type;
 
   bool _empty = false;
 }
diff --git a/pubspec.lock b/pubspec.lock
index 6d0e1d9..391f9f0 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -1,62 +1,55 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
-  archive:
-    dependency: transitive
-    description:
-      name: archive
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.11"
-  args:
-    dependency: transitive
-    description:
-      name: args
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.5.2"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.4.0"
+    version: "2.5.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "2.1.0"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.2"
-  collection:
+    version: "1.2.0"
+  clock:
     dependency: transitive
     description:
-      name: collection
+      name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.14.11"
-  convert:
+    version: "1.1.0"
+  collection:
     dependency: transitive
     description:
-      name: convert
+      name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.1"
-  crypto:
+    version: "1.15.0"
+  fake_async:
     dependency: transitive
     description:
-      name: crypto
+      name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.3"
+    version: "1.2.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -67,55 +60,39 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  image:
+  flutter_web_plugins:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  js:
     dependency: transitive
     description:
-      name: image
+      name: js
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.4"
+    version: "0.6.3"
   matcher:
     dependency: transitive
     description:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.6"
+    version: "0.12.10"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.8"
+    version: "1.3.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.4"
-  pedantic:
-    dependency: transitive
-    description:
-      name: pedantic
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.8.0+1"
-  petitparser:
-    dependency: transitive
-    description:
-      name: petitparser
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.4.0"
-  quiver:
-    dependency: transitive
-    description:
-      name: quiver
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.5"
+    version: "1.8.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -127,70 +104,77 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.5.5"
+    version: "1.8.0"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.3"
+    version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.1.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.11"
+    version: "0.2.19"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.6"
+    version: "1.3.0"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.8"
+    version: "2.1.0"
   video_player:
     dependency: "direct dev"
     description:
       name: video_player
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.10.1+5"
-  xml:
+    version: "2.0.2"
+  video_player_platform_interface:
     dependency: transitive
     description:
-      name: xml
+      name: video_player_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.5.0"
+    version: "4.0.0"
+  video_player_web:
+    dependency: transitive
+    description:
+      name: video_player_web
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
 sdks:
-  dart: ">=2.4.0 <3.0.0"
-  flutter: ">=1.10.0 <2.0.0"
+  dart: ">=2.12.0 <3.0.0"
+  flutter: ">=1.20.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index 96f2533..785b4bf 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,7 +1,7 @@
 name: picker
 description: Flutter plugin for selecting images from the Android and iOS, taking new pictures with the camera and saves on Gallery
 homepage: https://github.com/jonataslaw/picker
-version: 1.0.3+1
+version: 2.0.0+1
 
 flutter:
   plugin:
@@ -17,10 +17,10 @@ dependencies:
     sdk: flutter
 
 dev_dependencies:
-  video_player: 0.10.1+5
+  video_player: ^2.0.2
   flutter_test:
     sdk: flutter
 
 environment:
-  sdk: ">=2.0.0-dev.28.0 <3.0.0"
-  flutter: ">=1.10.0 <2.0.0"
+  sdk: '>=2.12.0 <3.0.0'
+  flutter: ">=1.10.0 <3.0.0"
diff --git a/test/picker_test.dart b/test/picker_test.dart
index d4b09c4..8ec03db 100644
--- a/test/picker_test.dart
+++ b/test/picker_test.dart
@@ -180,7 +180,7 @@ void main() {
         });
         final LostDataResponse response = await Picker.retrieveLostData();
         expect(response.type, RetrieveType.image);
-        expect(response.file.path, '/example/path');
+        expect(response.file!.path, '/example/path');
       });
 
       test('retrieveLostData get error response', () async {
@@ -193,8 +193,8 @@ void main() {
         });
         final LostDataResponse response = await Picker.retrieveLostData();
         expect(response.type, RetrieveType.video);
-        expect(response.exception.code, 'test_error_code');
-        expect(response.exception.message, 'test_error_message');
+        expect(response.exception!.code, 'test_error_code');
+        expect(response.exception!.message, 'test_error_message');
       });
 
       test('retrieveLostData get null response', () async {