diff --git a/dwds/lib/src/utilities/sdk_configuration.dart b/dwds/lib/src/utilities/sdk_configuration.dart
index eb650187e..0439e01e6 100644
--- a/dwds/lib/src/utilities/sdk_configuration.dart
+++ b/dwds/lib/src/utilities/sdk_configuration.dart
@@ -120,7 +120,7 @@ class SdkConfiguration {
 class DefaultSdkConfigurationProvider extends SdkConfigurationProvider {
   DefaultSdkConfigurationProvider();
 
-  late SdkConfiguration _configuration = _create();
+  late final SdkConfiguration _configuration = _create();
 
   /// Create and validate configuration matching the default SDK layout.
   @override
diff --git a/dwds/tool/copy_builder.dart b/dwds/tool/copy_builder.dart
index 99e10bc7c..93f9b9707 100644
--- a/dwds/tool/copy_builder.dart
+++ b/dwds/tool/copy_builder.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// @dart = 2.9
-
 import 'package:build/build.dart';
 
 /// Factory for the build script.