diff --git a/.github/workflows/dart.yml b/.github/workflows/dart.yml
index e3080e1..d5e8928 100644
--- a/.github/workflows/dart.yml
+++ b/.github/workflows/dart.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     container:
-      image:  google/dart:2.12-dev
+      image:  google/dart:2.12-beta
 
     steps:
     - uses: actions/checkout@v2
diff --git a/test/value/value_controller.mocks.dart b/test/value/value_controller.mocks.dart
index 855c135..6bdf738 100644
--- a/test/value/value_controller.mocks.dart
+++ b/test/value/value_controller.mocks.dart
@@ -6,6 +6,8 @@ import 'package:mockito/mockito.dart' as _i1;
 
 // ignore_for_file: unnecessary_parenthesis
 
+// ignore_for_file: extra_positional_arguments_could_be_named
+
 class _FakeStreamSink<S> extends _i1.Fake implements _i2.StreamSink<S> {}
 
 /// A class which mocks [StreamController].