diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index 9471c512ccdd..072bbac42d53 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-67254d6e4b0369fa83418cf9e9ff68b21c529765
+8d83b98c55b3d0839de0c4201f5a8d56dbf92d2f
diff --git a/dev/automated_tests/pubspec.yaml b/dev/automated_tests/pubspec.yaml
index fc9014775a6c..5ddc94cd7f58 100644
--- a/dev/automated_tests/pubspec.yaml
+++ b/dev/automated_tests/pubspec.yaml
@@ -1,7 +1,7 @@
 name: flutter_automated_tests
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/benchmarks/complex_layout/pubspec.yaml b/dev/benchmarks/complex_layout/pubspec.yaml
index 2525ce9d1fa1..2b87c0adc9aa 100644
--- a/dev/benchmarks/complex_layout/pubspec.yaml
+++ b/dev/benchmarks/complex_layout/pubspec.yaml
@@ -2,7 +2,7 @@ name: complex_layout
 description: A benchmark of a relatively complex layout.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/benchmarks/macrobenchmarks/pubspec.yaml b/dev/benchmarks/macrobenchmarks/pubspec.yaml
index b1e58fa56378..d8f6b9887184 100644
--- a/dev/benchmarks/macrobenchmarks/pubspec.yaml
+++ b/dev/benchmarks/macrobenchmarks/pubspec.yaml
@@ -2,7 +2,7 @@ name: macrobenchmarks
 description: Performance benchmarks using flutter drive.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/benchmarks/microbenchmarks/pubspec.yaml b/dev/benchmarks/microbenchmarks/pubspec.yaml
index 93fb7995434c..8cac43e6f38d 100644
--- a/dev/benchmarks/microbenchmarks/pubspec.yaml
+++ b/dev/benchmarks/microbenchmarks/pubspec.yaml
@@ -2,7 +2,7 @@ name: microbenchmarks
 description: Small benchmarks for very specific parts of the Flutter framework.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   meta: 1.8.0
diff --git a/dev/benchmarks/multiple_flutters/module/pubspec.yaml b/dev/benchmarks/multiple_flutters/module/pubspec.yaml
index 12d128d2a6bf..f601fd8abc80 100644
--- a/dev/benchmarks/multiple_flutters/module/pubspec.yaml
+++ b/dev/benchmarks/multiple_flutters/module/pubspec.yaml
@@ -4,7 +4,7 @@ description: A module that is embedded in the multiple_flutters benchmark test.
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/benchmarks/platform_channels_benchmarks/pubspec.yaml b/dev/benchmarks/platform_channels_benchmarks/pubspec.yaml
index 908500cf2b8d..7a65a39e6c25 100644
--- a/dev/benchmarks/platform_channels_benchmarks/pubspec.yaml
+++ b/dev/benchmarks/platform_channels_benchmarks/pubspec.yaml
@@ -5,7 +5,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/benchmarks/platform_views_layout/pubspec.yaml b/dev/benchmarks/platform_views_layout/pubspec.yaml
index 40b3cf9ce90f..ecbe18af8f5b 100644
--- a/dev/benchmarks/platform_views_layout/pubspec.yaml
+++ b/dev/benchmarks/platform_views_layout/pubspec.yaml
@@ -2,7 +2,7 @@ name: platform_views_layout
 description: A benchmark for platform views.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/benchmarks/platform_views_layout_hybrid_composition/pubspec.yaml b/dev/benchmarks/platform_views_layout_hybrid_composition/pubspec.yaml
index 1f0097bb0f48..563229913acc 100644
--- a/dev/benchmarks/platform_views_layout_hybrid_composition/pubspec.yaml
+++ b/dev/benchmarks/platform_views_layout_hybrid_composition/pubspec.yaml
@@ -2,7 +2,7 @@ name: platform_views_layout_hybrid_composition
 description: A benchmark for platform views, using hybrid composition on android.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/benchmarks/test_apps/stocks/pubspec.yaml b/dev/benchmarks/test_apps/stocks/pubspec.yaml
index ed85f8bae33e..e62b8ff9a998 100644
--- a/dev/benchmarks/test_apps/stocks/pubspec.yaml
+++ b/dev/benchmarks/test_apps/stocks/pubspec.yaml
@@ -1,7 +1,7 @@
 name: stocks
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/bots/pubspec.yaml b/dev/bots/pubspec.yaml
index 48a361df46af..9747eff91026 100644
--- a/dev/bots/pubspec.yaml
+++ b/dev/bots/pubspec.yaml
@@ -2,7 +2,7 @@ name: tests_on_bots
 description: Scripts which run on bots.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   args: 2.3.1
diff --git a/dev/conductor/core/pubspec.yaml b/dev/conductor/core/pubspec.yaml
index aca9675a1189..d06e42280529 100644
--- a/dev/conductor/core/pubspec.yaml
+++ b/dev/conductor/core/pubspec.yaml
@@ -4,7 +4,7 @@ description: Flutter Automated Release Tool
 publish_to: none
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   archive: 3.3.2
diff --git a/dev/customer_testing/pubspec.yaml b/dev/customer_testing/pubspec.yaml
index 761d57f8648d..fa0c77905e88 100644
--- a/dev/customer_testing/pubspec.yaml
+++ b/dev/customer_testing/pubspec.yaml
@@ -2,7 +2,7 @@ name: customer_testing
 description: Tool to run the tests listed in the flutter/tests repository.
 
 environment:
-  sdk: '>=2.17.0-0 <3.0.0'
+  sdk: '>=2.17.0-0 <4.0.0'
 
 dependencies:
   args: 2.3.1
diff --git a/dev/devicelab/bin/tasks/gradle_desugar_classes_test.dart b/dev/devicelab/bin/tasks/gradle_desugar_classes_test.dart
index 4fe64d52d081..ec6cec85adcf 100644
--- a/dev/devicelab/bin/tasks/gradle_desugar_classes_test.dart
+++ b/dev/devicelab/bin/tasks/gradle_desugar_classes_test.dart
@@ -15,7 +15,8 @@ Future<void> main() async {
     try {
       await runProjectTest((FlutterProject flutterProject) async {
         section('APK contains plugin classes');
-        flutterProject.addPlugin('google_maps_flutter', value: '^1.0.10');
+        await flutterProject.setMinSdkVersion(20);
+        flutterProject.addPlugin('google_maps_flutter', value: '^2.2.1');
 
         await inDirectory(flutterProject.rootPath, () async {
           await flutter('build', options: <String>[
diff --git a/dev/devicelab/bin/tasks/module_test_ios.dart b/dev/devicelab/bin/tasks/module_test_ios.dart
index f2322c3c0a72..86d47afe3576 100644
--- a/dev/devicelab/bin/tasks/module_test_ios.dart
+++ b/dev/devicelab/bin/tasks/module_test_ios.dart
@@ -170,7 +170,7 @@ Future<void> main() async {
         '''
 dependencies:
   url_launcher: 6.0.20
-  android_alarm_manager: 0.4.5+11
+  android_alarm_manager: 2.0.2
   google_sign_in_ios: 5.5.0
   $dartPluginName:
     path: ../$dartPluginName
diff --git a/dev/devicelab/bin/tasks/plugin_dependencies_test.dart b/dev/devicelab/bin/tasks/plugin_dependencies_test.dart
index 26d8dada3afa..fa2bd9e90dc2 100644
--- a/dev/devicelab/bin/tasks/plugin_dependencies_test.dart
+++ b/dev/devicelab/bin/tasks/plugin_dependencies_test.dart
@@ -101,7 +101,7 @@ dependencies:
     sdk: flutter
 
 environment:
-  sdk: ">=2.0.0-dev.28.0 <3.0.0"
+  sdk: ">=2.0.0-dev.28.0 <4.0.0"
   flutter: ">=1.5.0"
 ''', flush: true);
 
diff --git a/dev/devicelab/lib/framework/apk_utils.dart b/dev/devicelab/lib/framework/apk_utils.dart
index e9a989cefd2d..e79bd6b5e1d1 100644
--- a/dev/devicelab/lib/framework/apk_utils.dart
+++ b/dev/devicelab/lib/framework/apk_utils.dart
@@ -287,6 +287,20 @@ android {
     pubspec.writeAsStringSync(content, flush: true);
   }
 
+  Future<void> setMinSdkVersion(int sdkVersion) async {
+    final File buildScript = File(
+      path.join(androidPath, 'app', 'build.gradle'),
+    );
+
+    buildScript.openWrite(mode: FileMode.append).write('''
+android {
+    defaultConfig {
+        minSdkVersion $sdkVersion
+    }
+}
+    ''');
+  }
+
   Future<void> getPackages() async {
     await inDirectory(Directory(rootPath), () async {
       await flutter('pub', options: <String>['get']);
diff --git a/dev/devicelab/pubspec.yaml b/dev/devicelab/pubspec.yaml
index c988e9a6a71d..a6dc98aaeb3b 100644
--- a/dev/devicelab/pubspec.yaml
+++ b/dev/devicelab/pubspec.yaml
@@ -3,7 +3,7 @@ description: Flutter continuous integration performance and correctness tests.
 homepage: https://github.com/flutter/flutter
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   archive: 3.3.2
diff --git a/dev/docs/platform_integration/pubspec.yaml b/dev/docs/platform_integration/pubspec.yaml
index e56e23d2b057..bb60d621c47a 100644
--- a/dev/docs/platform_integration/pubspec.yaml
+++ b/dev/docs/platform_integration/pubspec.yaml
@@ -1,4 +1,4 @@
 name: platform_integration
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
diff --git a/dev/forbidden_from_release_tests/pubspec.yaml b/dev/forbidden_from_release_tests/pubspec.yaml
index f1ca8df58861..cdee1c9ba646 100644
--- a/dev/forbidden_from_release_tests/pubspec.yaml
+++ b/dev/forbidden_from_release_tests/pubspec.yaml
@@ -2,7 +2,7 @@ name: forbidden_from_release_tests
 publish_to: 'none'
 
 environment:
-  sdk: '>=2.17.0-0 <3.0.0'
+  sdk: '>=2.17.0-0 <4.0.0'
 
 dependencies:
   args: 2.3.1
diff --git a/dev/integration_tests/abstract_method_smoke_test/pubspec.yaml b/dev/integration_tests/abstract_method_smoke_test/pubspec.yaml
index 574e7d7087fa..ad67cfa39caf 100644
--- a/dev/integration_tests/abstract_method_smoke_test/pubspec.yaml
+++ b/dev/integration_tests/abstract_method_smoke_test/pubspec.yaml
@@ -4,7 +4,7 @@ description: A new Flutter project.
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/android_embedding_v2_smoke_test/pubspec.yaml b/dev/integration_tests/android_embedding_v2_smoke_test/pubspec.yaml
index a9ed6c6f180e..bf241be79f0e 100644
--- a/dev/integration_tests/android_embedding_v2_smoke_test/pubspec.yaml
+++ b/dev/integration_tests/android_embedding_v2_smoke_test/pubspec.yaml
@@ -14,7 +14,7 @@ description: A new Flutter project.
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/android_semantics_testing/pubspec.yaml b/dev/integration_tests/android_semantics_testing/pubspec.yaml
index e09fa1c4196f..bacd717bab8b 100644
--- a/dev/integration_tests/android_semantics_testing/pubspec.yaml
+++ b/dev/integration_tests/android_semantics_testing/pubspec.yaml
@@ -1,7 +1,7 @@
 name: android_semantics_testing
 description: Integration testing library for Android semantics
 environment:
-  sdk: '>=2.17.0-0 <3.0.0'
+  sdk: '>=2.17.0-0 <4.0.0'
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/android_views/pubspec.yaml b/dev/integration_tests/android_views/pubspec.yaml
index 6d38686f89ff..d02be80efb9a 100644
--- a/dev/integration_tests/android_views/pubspec.yaml
+++ b/dev/integration_tests/android_views/pubspec.yaml
@@ -4,7 +4,7 @@ publish_to: none
 description: An integration test for embedded platform views
 version: 1.0.0+1
 environment:
-  sdk: '>=2.17.0-0 <3.0.0'
+  sdk: '>=2.17.0-0 <4.0.0'
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/channels/pubspec.yaml b/dev/integration_tests/channels/pubspec.yaml
index fd430d273cfe..a4f5fbbcd536 100644
--- a/dev/integration_tests/channels/pubspec.yaml
+++ b/dev/integration_tests/channels/pubspec.yaml
@@ -2,7 +2,7 @@ name: channels
 description: Integration test for platform channels.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/deferred_components_test/pubspec.yaml b/dev/integration_tests/deferred_components_test/pubspec.yaml
index 06dc851c3d79..55e62304ae95 100644
--- a/dev/integration_tests/deferred_components_test/pubspec.yaml
+++ b/dev/integration_tests/deferred_components_test/pubspec.yaml
@@ -3,7 +3,7 @@ description: Integration test application for basic deferred components function
 publish_to: 'none'
 version: 1.0.0+1
 environment:
-  sdk: '>=2.17.0-0 <3.0.0'
+  sdk: '>=2.17.0-0 <4.0.0'
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/external_ui/pubspec.yaml b/dev/integration_tests/external_ui/pubspec.yaml
index ca9407b7f4ff..36f3db98a878 100644
--- a/dev/integration_tests/external_ui/pubspec.yaml
+++ b/dev/integration_tests/external_ui/pubspec.yaml
@@ -2,7 +2,7 @@ name: external_ui
 description: A test of Flutter integrating external UIs.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/flavors/pubspec.yaml b/dev/integration_tests/flavors/pubspec.yaml
index a87e62550f9c..94293f889a83 100644
--- a/dev/integration_tests/flavors/pubspec.yaml
+++ b/dev/integration_tests/flavors/pubspec.yaml
@@ -2,7 +2,7 @@ name: flavors
 description: Integration test for build flavors.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/flutter_gallery/pubspec.yaml b/dev/integration_tests/flutter_gallery/pubspec.yaml
index 9440b69a84ca..cfc5f5a7dfdf 100644
--- a/dev/integration_tests/flutter_gallery/pubspec.yaml
+++ b/dev/integration_tests/flutter_gallery/pubspec.yaml
@@ -1,7 +1,7 @@
 name: flutter_gallery
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
@@ -20,7 +20,7 @@ dependencies:
     git:
       url: https://github.com/kevmoo/scoped_model.git
       ref: null_safety
-  shrine_images: 1.1.2
+  shrine_images: 2.0.1
 
   # Also update dev/benchmarks/complex_layout/pubspec.yaml
   # and dev/benchmarks/macrobenchmarks/pubspec.yaml
diff --git a/dev/integration_tests/gradle_deprecated_settings/pubspec.yaml b/dev/integration_tests/gradle_deprecated_settings/pubspec.yaml
index cd92473dc0e8..527084dd4348 100644
--- a/dev/integration_tests/gradle_deprecated_settings/pubspec.yaml
+++ b/dev/integration_tests/gradle_deprecated_settings/pubspec.yaml
@@ -2,7 +2,7 @@ name: gradle_deprecated_settings
 description: Integration test for the current settings.gradle.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/hybrid_android_views/pubspec.yaml b/dev/integration_tests/hybrid_android_views/pubspec.yaml
index 5fe5c7dd323e..1f7dab529690 100644
--- a/dev/integration_tests/hybrid_android_views/pubspec.yaml
+++ b/dev/integration_tests/hybrid_android_views/pubspec.yaml
@@ -4,7 +4,7 @@ publish_to: none
 description: An integration test for hybrid composition on Android
 version: 1.0.0+1
 environment:
-  sdk: '>=2.17.0-0 <3.0.0'
+  sdk: '>=2.17.0-0 <4.0.0'
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/ios_add2app_life_cycle/flutterapp/pubspec.yaml b/dev/integration_tests/ios_add2app_life_cycle/flutterapp/pubspec.yaml
index 6ac8a9405c66..82dd676480ad 100644
--- a/dev/integration_tests/ios_add2app_life_cycle/flutterapp/pubspec.yaml
+++ b/dev/integration_tests/ios_add2app_life_cycle/flutterapp/pubspec.yaml
@@ -14,7 +14,7 @@ description: A new flutter module project.
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/ios_app_with_extensions/pubspec.yaml b/dev/integration_tests/ios_app_with_extensions/pubspec.yaml
index 1f8d016396c4..b9912f64ead0 100644
--- a/dev/integration_tests/ios_app_with_extensions/pubspec.yaml
+++ b/dev/integration_tests/ios_app_with_extensions/pubspec.yaml
@@ -13,7 +13,7 @@ name: ios_app_with_extensions
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/ios_platform_view_tests/pubspec.yaml b/dev/integration_tests/ios_platform_view_tests/pubspec.yaml
index f535c7ee5c73..1e2af467372a 100644
--- a/dev/integration_tests/ios_platform_view_tests/pubspec.yaml
+++ b/dev/integration_tests/ios_platform_view_tests/pubspec.yaml
@@ -3,7 +3,7 @@ name: ios_platform_view_tests
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/non_nullable/pubspec.yaml b/dev/integration_tests/non_nullable/pubspec.yaml
index 595ce00d5c01..daea3229aca8 100644
--- a/dev/integration_tests/non_nullable/pubspec.yaml
+++ b/dev/integration_tests/non_nullable/pubspec.yaml
@@ -5,7 +5,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/platform_interaction/pubspec.yaml b/dev/integration_tests/platform_interaction/pubspec.yaml
index f700ef0a9dac..b6ce71adad2b 100644
--- a/dev/integration_tests/platform_interaction/pubspec.yaml
+++ b/dev/integration_tests/platform_interaction/pubspec.yaml
@@ -2,7 +2,7 @@ name: platform_interaction
 description: Integration test for platform interactions.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/release_smoke_test/pubspec.yaml b/dev/integration_tests/release_smoke_test/pubspec.yaml
index efb3269e72fe..37b2a4feb5ef 100644
--- a/dev/integration_tests/release_smoke_test/pubspec.yaml
+++ b/dev/integration_tests/release_smoke_test/pubspec.yaml
@@ -1,7 +1,7 @@
 name: release_smoke_test
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/spell_check/pubspec.yaml b/dev/integration_tests/spell_check/pubspec.yaml
index 228c9fee6280..816bbcdf0820 100644
--- a/dev/integration_tests/spell_check/pubspec.yaml
+++ b/dev/integration_tests/spell_check/pubspec.yaml
@@ -18,7 +18,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: '>=2.18.0-149.0.dev <3.0.0'
+  sdk: '>=2.18.0-149.0.dev <4.0.0'
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions
diff --git a/dev/integration_tests/ui/pubspec.yaml b/dev/integration_tests/ui/pubspec.yaml
index 4a0cc9b10414..94d7a13eecab 100644
--- a/dev/integration_tests/ui/pubspec.yaml
+++ b/dev/integration_tests/ui/pubspec.yaml
@@ -2,7 +2,7 @@ name: integration_ui
 description: Flutter non-plugin UI integration tests.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/web/pubspec.yaml b/dev/integration_tests/web/pubspec.yaml
index 891688a221c5..17171c06c404 100644
--- a/dev/integration_tests/web/pubspec.yaml
+++ b/dev/integration_tests/web/pubspec.yaml
@@ -2,7 +2,7 @@ name: web_integration
 description: Integration test for web compilation.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 flutter:
   assets:
diff --git a/dev/integration_tests/web_compile_tests/pubspec.yaml b/dev/integration_tests/web_compile_tests/pubspec.yaml
index e3af760f7a3f..764ef90b3326 100644
--- a/dev/integration_tests/web_compile_tests/pubspec.yaml
+++ b/dev/integration_tests/web_compile_tests/pubspec.yaml
@@ -1,6 +1,6 @@
 name: web_compile_tests
 environment:
-  sdk: '>=2.17.0-0 <3.0.0'
+  sdk: '>=2.17.0-0 <4.0.0'
 
 dependencies:
   flutter:
diff --git a/dev/integration_tests/web_e2e_tests/pubspec.yaml b/dev/integration_tests/web_e2e_tests/pubspec.yaml
index d68faff9bfd8..16c32a05f5dc 100644
--- a/dev/integration_tests/web_e2e_tests/pubspec.yaml
+++ b/dev/integration_tests/web_e2e_tests/pubspec.yaml
@@ -2,7 +2,7 @@ name: web_e2e_tests
 publish_to: none
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 flutter:
   assets:
diff --git a/dev/integration_tests/windows_startup_test/pubspec.yaml b/dev/integration_tests/windows_startup_test/pubspec.yaml
index 9615ec6be0e0..c364506ec7f2 100644
--- a/dev/integration_tests/windows_startup_test/pubspec.yaml
+++ b/dev/integration_tests/windows_startup_test/pubspec.yaml
@@ -2,7 +2,7 @@ name: windows_startup_test
 description: Integration test for Windows app's startup.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/manual_tests/pubspec.yaml b/dev/manual_tests/pubspec.yaml
index 403c342c5a51..fd31fe3bf797 100644
--- a/dev/manual_tests/pubspec.yaml
+++ b/dev/manual_tests/pubspec.yaml
@@ -1,7 +1,7 @@
 name: manual_tests
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/missing_dependency_tests/pubspec.yaml b/dev/missing_dependency_tests/pubspec.yaml
index bd8d667b1ea5..ebed8816e981 100644
--- a/dev/missing_dependency_tests/pubspec.yaml
+++ b/dev/missing_dependency_tests/pubspec.yaml
@@ -1,7 +1,7 @@
 name: missing_dependency_tests
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/tools/dartdoc.dart b/dev/tools/dartdoc.dart
index 7c9ffaf009d1..f577cadd9465 100644
--- a/dev/tools/dartdoc.dart
+++ b/dev/tools/dartdoc.dart
@@ -59,7 +59,7 @@ Future<void> main(List<String> arguments) async {
   buf.writeln('homepage: https://flutter.dev');
   buf.writeln('version: 0.0.0');
   buf.writeln('environment:');
-  buf.writeln("  sdk: '>=2.10.0 <3.0.0'");
+  buf.writeln("  sdk: '>=2.10.0 <4.0.0'");
   buf.writeln('dependencies:');
   for (final String package in findPackageNames()) {
     buf.writeln('  $package:');
diff --git a/dev/tools/gen_defaults/pubspec.yaml b/dev/tools/gen_defaults/pubspec.yaml
index 2f42ef652a03..ed298d766c6e 100644
--- a/dev/tools/gen_defaults/pubspec.yaml
+++ b/dev/tools/gen_defaults/pubspec.yaml
@@ -3,7 +3,7 @@ description: A command line script to generate Material component defaults from
 version: 1.0.0
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
 
diff --git a/dev/tools/gen_keycodes/pubspec.yaml b/dev/tools/gen_keycodes/pubspec.yaml
index 985e4195d1b3..08c98045681b 100644
--- a/dev/tools/gen_keycodes/pubspec.yaml
+++ b/dev/tools/gen_keycodes/pubspec.yaml
@@ -2,7 +2,7 @@ name: gen_keycodes
 description: Generates keycode source files from various resources.
 
 environment:
-  sdk: ">=2.18.0-0 <3.0.0"
+  sdk: ">=2.18.0-0 <4.0.0"
 
 dependencies:
   args: 2.3.1
diff --git a/dev/tools/pubspec.yaml b/dev/tools/pubspec.yaml
index 07931974c71d..7fb6252daaa9 100644
--- a/dev/tools/pubspec.yaml
+++ b/dev/tools/pubspec.yaml
@@ -2,7 +2,7 @@ name: dev_tools
 description: Various repository development tools for flutter.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   archive: 3.3.2
diff --git a/dev/tools/vitool/pubspec.yaml b/dev/tools/vitool/pubspec.yaml
index 2cb22f6082f1..d2e8ee37fc2b 100644
--- a/dev/tools/vitool/pubspec.yaml
+++ b/dev/tools/vitool/pubspec.yaml
@@ -4,7 +4,7 @@ version: 0.0.1
 homepage: https://flutter.dev
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/dev/tracing_tests/pubspec.yaml b/dev/tracing_tests/pubspec.yaml
index ba218b47eae3..e8937ed96914 100644
--- a/dev/tracing_tests/pubspec.yaml
+++ b/dev/tracing_tests/pubspec.yaml
@@ -2,7 +2,7 @@ name: tracing_tests
 description: Various tests for tracing in flutter/flutter
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/examples/api/pubspec.yaml b/examples/api/pubspec.yaml
index 9646c0c92782..40695ebde954 100644
--- a/examples/api/pubspec.yaml
+++ b/examples/api/pubspec.yaml
@@ -7,7 +7,7 @@ publish_to: 'none'
 version: 1.0.0
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
   flutter: ">=2.5.0-6.0.pre.30 <3.0.0"
 
 dependencies:
diff --git a/examples/flutter_view/pubspec.yaml b/examples/flutter_view/pubspec.yaml
index 4be70dd1bde8..03b0f21e4299 100644
--- a/examples/flutter_view/pubspec.yaml
+++ b/examples/flutter_view/pubspec.yaml
@@ -2,7 +2,7 @@ name: flutter_view
 description: A new flutter project.
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/examples/hello_world/pubspec.yaml b/examples/hello_world/pubspec.yaml
index 9b92c2858a1d..1fd49c7803b9 100644
--- a/examples/hello_world/pubspec.yaml
+++ b/examples/hello_world/pubspec.yaml
@@ -1,7 +1,7 @@
 name: hello_world
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/examples/image_list/pubspec.yaml b/examples/image_list/pubspec.yaml
index a91814007616..12a7b7ddf577 100644
--- a/examples/image_list/pubspec.yaml
+++ b/examples/image_list/pubspec.yaml
@@ -4,7 +4,7 @@ description: Simple Flutter project used for benchmarking image loading over net
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/examples/layers/pubspec.yaml b/examples/layers/pubspec.yaml
index b56c8e79734f..7a32fc09fa07 100644
--- a/examples/layers/pubspec.yaml
+++ b/examples/layers/pubspec.yaml
@@ -1,7 +1,7 @@
 name: flutter_examples_layers
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/examples/platform_channel/pubspec.yaml b/examples/platform_channel/pubspec.yaml
index 13036da9fd6d..166c45ad0297 100644
--- a/examples/platform_channel/pubspec.yaml
+++ b/examples/platform_channel/pubspec.yaml
@@ -1,7 +1,7 @@
 name: platform_channel
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/examples/platform_channel_swift/pubspec.yaml b/examples/platform_channel_swift/pubspec.yaml
index e2f38d0c0da8..c6b168a170e6 100644
--- a/examples/platform_channel_swift/pubspec.yaml
+++ b/examples/platform_channel_swift/pubspec.yaml
@@ -1,7 +1,7 @@
 name: platform_channel_swift
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/examples/platform_view/pubspec.yaml b/examples/platform_view/pubspec.yaml
index 025e7316214f..62aad0c1078a 100644
--- a/examples/platform_view/pubspec.yaml
+++ b/examples/platform_view/pubspec.yaml
@@ -1,7 +1,7 @@
 name: platform_view
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/examples/splash/pubspec.yaml b/examples/splash/pubspec.yaml
index 7e1bc369c8ac..8a5ccb9ecf24 100644
--- a/examples/splash/pubspec.yaml
+++ b/examples/splash/pubspec.yaml
@@ -1,7 +1,7 @@
 name: splash
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/packages/flutter/pubspec.yaml b/packages/flutter/pubspec.yaml
index ede82b6dac82..559f90ebc046 100644
--- a/packages/flutter/pubspec.yaml
+++ b/packages/flutter/pubspec.yaml
@@ -3,7 +3,7 @@ description: A framework for writing Flutter applications
 homepage: https://flutter.dev
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
diff --git a/packages/flutter/test_private/pubspec.yaml b/packages/flutter/test_private/pubspec.yaml
index 30fabe9a80ef..ebfc1efaffae 100644
--- a/packages/flutter/test_private/pubspec.yaml
+++ b/packages/flutter/test_private/pubspec.yaml
@@ -2,7 +2,7 @@ name: flutter_test_private
 description: Tests private interfaces of the flutter
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
diff --git a/packages/flutter/test_private/test/pubspec.yaml b/packages/flutter/test_private/test/pubspec.yaml
index 37e60ba555e7..0a62c7c130f4 100644
--- a/packages/flutter/test_private/test/pubspec.yaml
+++ b/packages/flutter/test_private/test/pubspec.yaml
@@ -1,7 +1,7 @@
 name: animated_icons_private_test
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
diff --git a/packages/flutter_driver/pubspec.yaml b/packages/flutter_driver/pubspec.yaml
index dff59deeb748..7b7295a8be14 100644
--- a/packages/flutter_driver/pubspec.yaml
+++ b/packages/flutter_driver/pubspec.yaml
@@ -3,7 +3,7 @@ description: Integration and performance test API for Flutter applications
 homepage: https://flutter.dev
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   file: 6.1.4
diff --git a/packages/flutter_goldens/pubspec.yaml b/packages/flutter_goldens/pubspec.yaml
index d69dcd5fd509..26b5489159d9 100644
--- a/packages/flutter_goldens/pubspec.yaml
+++ b/packages/flutter_goldens/pubspec.yaml
@@ -1,7 +1,7 @@
 name: flutter_goldens
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
diff --git a/packages/flutter_goldens_client/pubspec.yaml b/packages/flutter_goldens_client/pubspec.yaml
index d9efaed2c5db..9cfec36f06ce 100644
--- a/packages/flutter_goldens_client/pubspec.yaml
+++ b/packages/flutter_goldens_client/pubspec.yaml
@@ -1,7 +1,7 @@
 name: flutter_goldens_client
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
diff --git a/packages/flutter_localizations/pubspec.yaml b/packages/flutter_localizations/pubspec.yaml
index 3cfda8d2a93e..79da1e0d363b 100644
--- a/packages/flutter_localizations/pubspec.yaml
+++ b/packages/flutter_localizations/pubspec.yaml
@@ -1,7 +1,7 @@
 name: flutter_localizations
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
diff --git a/packages/flutter_test/pubspec.yaml b/packages/flutter_test/pubspec.yaml
index fe6b7dcfb864..71b0e31f3784 100644
--- a/packages/flutter_test/pubspec.yaml
+++ b/packages/flutter_test/pubspec.yaml
@@ -1,7 +1,7 @@
 name: flutter_test
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
diff --git a/packages/flutter_test/test/test_config/project_root/pubspec.yaml b/packages/flutter_test/test/test_config/project_root/pubspec.yaml
index 8a39bec6b8f5..30c83394c6c8 100644
--- a/packages/flutter_test/test/test_config/project_root/pubspec.yaml
+++ b/packages/flutter_test/test/test_config/project_root/pubspec.yaml
@@ -4,6 +4,6 @@
 name: dummy
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.12.0 <4.0.0'
 
 # PUBSPEC CHECKSUM: 0000
diff --git a/packages/flutter_tools/lib/src/commands/update_packages.dart b/packages/flutter_tools/lib/src/commands/update_packages.dart
index ffaf2264572a..aa83b5a8564b 100644
--- a/packages/flutter_tools/lib/src/commands/update_packages.dart
+++ b/packages/flutter_tools/lib/src/commands/update_packages.dart
@@ -1427,7 +1427,7 @@ String generateFakePubspec(
   final bool verbose = doUpgrade;
   result.writeln('name: flutter_update_packages');
   result.writeln('environment:');
-  result.writeln("  sdk: '>=2.10.0 <3.0.0'");
+  result.writeln("  sdk: '>=2.10.0 <4.0.0'");
   result.writeln('dependencies:');
   overrides.writeln('dependency_overrides:');
   if (kManuallyPinnedDependencies.isNotEmpty) {
@@ -1640,7 +1640,7 @@ Directory createTemporaryFlutterSdk(
     // Fill in SDK dependency constraint.
     output.write('''
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: ">=2.7.0 <4.0.0"
 ''');
 
     output.writeln('dependencies:');
@@ -1672,7 +1672,7 @@ description: Dart SDK extensions for dart:ui
 homepage: http://flutter.io
 # sky_engine requires sdk_ext support in the analyzer which was added in 1.11.x
 environment:
-  sdk: '>=1.11.0 <3.0.0'
+  sdk: '>=1.11.0 <4.0.0'
 ''');
 
   return directory;
diff --git a/packages/flutter_tools/pubspec.yaml b/packages/flutter_tools/pubspec.yaml
index 91dafbe172c1..acacff48c686 100644
--- a/packages/flutter_tools/pubspec.yaml
+++ b/packages/flutter_tools/pubspec.yaml
@@ -3,7 +3,7 @@ description: Tools for building Flutter applications
 homepage: https://flutter.dev
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
diff --git a/packages/flutter_tools/test/commands.shard/hermetic/analyze_continuously_test.dart b/packages/flutter_tools/test/commands.shard/hermetic/analyze_continuously_test.dart
index 3039279c1f86..fabc5afe6077 100644
--- a/packages/flutter_tools/test/commands.shard/hermetic/analyze_continuously_test.dart
+++ b/packages/flutter_tools/test/commands.shard/hermetic/analyze_continuously_test.dart
@@ -60,7 +60,7 @@ void main() {
     pubspecFile.writeAsStringSync('''
   name: foo_project
   environment:
-    sdk: '>=2.10.0 <3.0.0'
+    sdk: '>=2.10.0 <4.0.0'
   ''');
 
     final File dartFile = fileSystem.file(fileSystem.path.join(directory.path, 'lib', 'main.dart'));
diff --git a/packages/flutter_tools/test/commands.shard/hermetic/update_packages_test.dart b/packages/flutter_tools/test/commands.shard/hermetic/update_packages_test.dart
index 2f205b53e98b..ced2dd0c45cf 100644
--- a/packages/flutter_tools/test/commands.shard/hermetic/update_packages_test.dart
+++ b/packages/flutter_tools/test/commands.shard/hermetic/update_packages_test.dart
@@ -24,7 +24,7 @@ description: A framework for writing Flutter applications
 homepage: http://flutter.dev
 
 environment:
-  sdk: ">=2.2.2 <3.0.0"
+  sdk: ">=2.2.2 <4.0.0"
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
@@ -61,7 +61,7 @@ homepage: http://flutter.dev
 version: 1.0.0
 
 environment:
-  sdk: ">=2.14.0-383.0.dev <3.0.0"
+  sdk: ">=2.14.0-383.0.dev <4.0.0"
   flutter: ">=2.5.0-6.0.pre.30 <3.0.0"
 
 dependencies:
diff --git a/packages/flutter_tools/test/data/asset_test/font/pubspec.yaml b/packages/flutter_tools/test/data/asset_test/font/pubspec.yaml
index 10e62a856414..654dc7590281 100644
--- a/packages/flutter_tools/test/data/asset_test/font/pubspec.yaml
+++ b/packages/flutter_tools/test/data/asset_test/font/pubspec.yaml
@@ -2,7 +2,7 @@ name: font
 description: A test project that contains a font.
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.12.0 <4.0.0"
 
 flutter:
   uses-material-design: true
diff --git a/packages/flutter_tools/test/data/asset_test/main/pubspec.yaml b/packages/flutter_tools/test/data/asset_test/main/pubspec.yaml
index 5a898f9ec010..2e1e9152ca7a 100644
--- a/packages/flutter_tools/test/data/asset_test/main/pubspec.yaml
+++ b/packages/flutter_tools/test/data/asset_test/main/pubspec.yaml
@@ -2,7 +2,7 @@ name: main
 description: A test project that has a package with a font as a dependency.
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.12.0 <4.0.0"
 
 dependencies:
   font:
diff --git a/packages/flutter_tools/test/general.shard/build_system/targets/dart_plugin_registrant_test.dart b/packages/flutter_tools/test/general.shard/build_system/targets/dart_plugin_registrant_test.dart
index 9bce7978277c..67d79aa9987b 100644
--- a/packages/flutter_tools/test/general.shard/build_system/targets/dart_plugin_registrant_test.dart
+++ b/packages/flutter_tools/test/general.shard/build_system/targets/dart_plugin_registrant_test.dart
@@ -86,7 +86,7 @@ flutter:
         pluginClass: none
 
 environment:
-  sdk: ">=2.12.0-259.9.beta <3.0.0"
+  sdk: ">=2.12.0-259.9.beta <4.0.0"
   flutter: ">=1.20.0"
 ''';
 
diff --git a/packages/flutter_tools/test/general.shard/test/test_compiler_test.dart b/packages/flutter_tools/test/general.shard/test/test_compiler_test.dart
index bd2bb06d079a..9d2da3668687 100644
--- a/packages/flutter_tools/test/general.shard/test/test_compiler_test.dart
+++ b/packages/flutter_tools/test/general.shard/test/test_compiler_test.dart
@@ -166,7 +166,7 @@ flutter:
       linux:
         dartPluginClass: APlugin
 environment:
-  sdk: ">=2.14.0 <3.0.0"
+  sdk: ">=2.14.0 <4.0.0"
   flutter: ">=2.5.0"
 ''');
 
diff --git a/packages/flutter_tools/test/general.shard/update_packages_test.dart b/packages/flutter_tools/test/general.shard/update_packages_test.dart
index 32f744554350..9a57293a9b9f 100644
--- a/packages/flutter_tools/test/general.shard/update_packages_test.dart
+++ b/packages/flutter_tools/test/general.shard/update_packages_test.dart
@@ -17,7 +17,7 @@ description: A framework for writing Flutter applications
 homepage: http://flutter.dev
 
 environment:
-  sdk: '>=2.2.2 <3.0.0'
+  sdk: '>=2.2.2 <4.0.0'
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
@@ -51,7 +51,7 @@ description: A dummy pubspec with no dependencies
 homepage: http://flutter.dev
 
 environment:
-  sdk: ">=2.2.2 <3.0.0"
+  sdk: ">=2.2.2 <4.0.0"
 ''';
 
 const String kInvalidGitPubspec = '''
@@ -60,7 +60,7 @@ description: A framework for writing Flutter applications
 homepage: http://flutter.dev
 
 environment:
-  sdk: ">=2.2.2 <3.0.0"
+  sdk: ">=2.2.2 <4.0.0"
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
diff --git a/packages/flutter_tools/test/integration.shard/analyze_once_test.dart b/packages/flutter_tools/test/integration.shard/analyze_once_test.dart
index 5b3b3488a926..72f13e6890e0 100644
--- a/packages/flutter_tools/test/integration.shard/analyze_once_test.dart
+++ b/packages/flutter_tools/test/integration.shard/analyze_once_test.dart
@@ -465,7 +465,7 @@ class _MyHomePageState extends State<MyHomePage> {
 const String pubspecYamlSrc = r'''
 name: flutter_project
 environment:
-  sdk: ">=2.1.0 <3.0.0"
+  sdk: ">=2.1.0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/packages/flutter_tools/test/integration.shard/break_on_framework_exceptions_test.dart b/packages/flutter_tools/test/integration.shard/break_on_framework_exceptions_test.dart
index 960361dec9e3..57762ba6a6a1 100644
--- a/packages/flutter_tools/test/integration.shard/break_on_framework_exceptions_test.dart
+++ b/packages/flutter_tools/test/integration.shard/break_on_framework_exceptions_test.dart
@@ -731,7 +731,7 @@ class TestProject extends Project {
   final String pubspec = '''
     name: test
     environment:
-      sdk: '>=2.12.0-0 <3.0.0'
+      sdk: '>=2.12.0-0 <4.0.0'
 
     dependencies:
       flutter:
diff --git a/packages/flutter_tools/test/integration.shard/flutter_build_null_unsafe_test.dart b/packages/flutter_tools/test/integration.shard/flutter_build_null_unsafe_test.dart
index 10326feed5b7..b4f6705c5c83 100644
--- a/packages/flutter_tools/test/integration.shard/flutter_build_null_unsafe_test.dart
+++ b/packages/flutter_tools/test/integration.shard/flutter_build_null_unsafe_test.dart
@@ -45,7 +45,7 @@ void main() {
     writeFile(fileSystem.path.join(projectRoot.path, 'pubspec.yaml'), '''
 name: hello
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.12.0 <4.0.0'
 ''');
     writeFile(fileSystem.path.join(projectRoot.path, 'lib', 'main.dart'), '''
 import 'unsafe.dart';
diff --git a/packages/flutter_tools/test/integration.shard/test_data/background_project.dart b/packages/flutter_tools/test/integration.shard/test_data/background_project.dart
index 270f3a454167..0fccff366c26 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/background_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/background_project.dart
@@ -12,7 +12,7 @@ class BackgroundProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: ">=2.12.0-0 <3.0.0"
+    sdk: ">=2.12.0-0 <4.0.0"
 
   dependencies:
     flutter:
@@ -63,7 +63,7 @@ class RepeatingBackgroundProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: ">=2.12.0-0 <3.0.0"
+    sdk: ">=2.12.0-0 <4.0.0"
 
   dependencies:
     flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/basic_project.dart b/packages/flutter_tools/test/integration.shard/test_data/basic_project.dart
index 12a77fed9c86..3f3c031cddc6 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/basic_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/basic_project.dart
@@ -10,7 +10,7 @@ class BasicProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=2.12.0-0 <3.0.0'
+    sdk: '>=2.12.0-0 <4.0.0'
 
   dependencies:
     flutter:
@@ -63,7 +63,7 @@ class BasicProjectThatThrows extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=2.12.0-0 <3.0.0'
+    sdk: '>=2.12.0-0 <4.0.0'
 
   dependencies:
     flutter:
@@ -120,7 +120,7 @@ class BasicProjectWithTimelineTraces extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=2.12.0-0 <3.0.0'
+    sdk: '>=2.12.0-0 <4.0.0'
 
   dependencies:
     flutter:
@@ -169,7 +169,7 @@ class BasicProjectWithFlutterGen extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=2.12.0-0 <3.0.0'
+    sdk: '>=2.12.0-0 <4.0.0'
 
   dependencies:
     flutter:
@@ -181,8 +181,6 @@ class BasicProjectWithFlutterGen extends Project {
 
   @override
   final String main = r'''
-  // @dart = 2.8
-  // generated package does not support null safety.
   import 'dart:async';
   import 'package:flutter_gen/flutter_gen.dart';
 
@@ -196,7 +194,7 @@ class BasicProjectWithUnaryMain extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=2.12.0-0 <3.0.0'
+    sdk: '>=2.12.0-0 <4.0.0'
   dependencies:
     flutter:
       sdk: flutter
diff --git a/packages/flutter_tools/test/integration.shard/test_data/compile_error_project.dart b/packages/flutter_tools/test/integration.shard/test_data/compile_error_project.dart
index 2732b38ba979..1ba2f5b62804 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/compile_error_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/compile_error_project.dart
@@ -10,7 +10,7 @@ class CompileErrorProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=2.12.0-0 <3.0.0'
+    sdk: '>=2.12.0-0 <4.0.0'
 
   dependencies:
     flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/deferred_components_project.dart b/packages/flutter_tools/test/integration.shard/test_data/deferred_components_project.dart
index b5ea7c6ea3e6..b135962465fb 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/deferred_components_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/deferred_components_project.dart
@@ -13,7 +13,7 @@ class DeferredComponentsProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: ">=2.12.0-0 <3.0.0"
+    sdk: ">=2.12.0-0 <4.0.0"
 
   dependencies:
     flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/gen_l10n_project.dart b/packages/flutter_tools/test/integration.shard/test_data/gen_l10n_project.dart
index 0723fe5b7235..13639aa3efb5 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/gen_l10n_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/gen_l10n_project.dart
@@ -34,7 +34,7 @@ class GenL10nProject extends Project {
   final String pubspec = '''
 name: test_l10n_project
 environment:
-  sdk: ">=2.12.0-0 <3.0.0"
+  sdk: ">=2.12.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/hot_reload_const_project.dart b/packages/flutter_tools/test/integration.shard/test_data/hot_reload_const_project.dart
index 0a2a1456ac97..d6d9c086a861 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/hot_reload_const_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/hot_reload_const_project.dart
@@ -10,7 +10,7 @@ class HotReloadConstProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: ">=2.12.0-0 <3.0.0"
+    sdk: ">=2.12.0-0 <4.0.0"
 
   dependencies:
     flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/hot_reload_project.dart b/packages/flutter_tools/test/integration.shard/test_data/hot_reload_project.dart
index 4ddb5be40ada..c61082b8a1ec 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/hot_reload_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/hot_reload_project.dart
@@ -12,7 +12,7 @@ class HotReloadProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: ">=2.12.0-0 <3.0.0"
+    sdk: ">=2.12.0-0 <4.0.0"
 
   dependencies:
     flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/hot_reload_with_asset.dart b/packages/flutter_tools/test/integration.shard/test_data/hot_reload_with_asset.dart
index 6cd7dc7dca01..ae26ac4e68bb 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/hot_reload_with_asset.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/hot_reload_with_asset.dart
@@ -10,7 +10,7 @@ class HotReloadWithAssetProject extends Project {
   final String pubspec = '''
 name: test
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: '>=2.12.0-0 <4.0.0'
 
 dependencies:
   flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/integration_tests_project.dart b/packages/flutter_tools/test/integration.shard/test_data/integration_tests_project.dart
index 8d24a8523c10..1a5c0ad67af9 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/integration_tests_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/integration_tests_project.dart
@@ -14,7 +14,7 @@ class IntegrationTestsProject extends Project implements TestsProject {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=2.12.0-0 <3.0.0'
+    sdk: '>=2.12.0-0 <4.0.0'
 
   dependencies:
     flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/migrate_project.dart b/packages/flutter_tools/test/integration.shard/test_data/migrate_project.dart
index e14d8b15978d..7b1b18725286 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/migrate_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/migrate_project.dart
@@ -176,7 +176,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.6.0 <3.0.0"
+  sdk: ">=2.6.0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/multidex_project.dart b/packages/flutter_tools/test/integration.shard/test_data/multidex_project.dart
index 2b0fc25b2893..26964c4f444a 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/multidex_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/multidex_project.dart
@@ -56,7 +56,7 @@ class MultidexProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: ">=2.12.0-0 <3.0.0"
+    sdk: ">=2.12.0-0 <4.0.0"
 
   dependencies:
     flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/project_with_early_error.dart b/packages/flutter_tools/test/integration.shard/test_data/project_with_early_error.dart
index 7578d6559c70..9c90f4981ace 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/project_with_early_error.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/project_with_early_error.dart
@@ -10,7 +10,7 @@ class ProjectWithEarlyError extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: ">=2.12.0-0 <3.0.0"
+    sdk: ">=2.12.0-0 <4.0.0"
 
   dependencies:
     flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/single_widget_reload_project.dart b/packages/flutter_tools/test/integration.shard/test_data/single_widget_reload_project.dart
index 083a0c04d300..690c71a2af91 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/single_widget_reload_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/single_widget_reload_project.dart
@@ -10,7 +10,7 @@ class SingleWidgetReloadProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: ">=2.12.0-0 <3.0.0"
+    sdk: ">=2.12.0-0 <4.0.0"
 
   dependencies:
     flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/stateless_stateful_project.dart b/packages/flutter_tools/test/integration.shard/test_data/stateless_stateful_project.dart
index 5d89cb914e24..e1c312ce94de 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/stateless_stateful_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/stateless_stateful_project.dart
@@ -10,7 +10,7 @@ class HotReloadProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: ">=2.12.0-0 <3.0.0"
+    sdk: ">=2.12.0-0 <4.0.0"
 
   dependencies:
     flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/stepping_project.dart b/packages/flutter_tools/test/integration.shard/test_data/stepping_project.dart
index d3a2bec2ca02..ce51fe469f1d 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/stepping_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/stepping_project.dart
@@ -9,7 +9,7 @@ class SteppingProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=2.12.0-0 <3.0.0'
+    sdk: '>=2.12.0-0 <4.0.0'
   dependencies:
     flutter:
       sdk: flutter
@@ -65,7 +65,7 @@ class WebSteppingProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=2.10.0 <3.0.0'
+    sdk: '>=2.10.0 <4.0.0'
   dependencies:
     flutter:
       sdk: flutter
diff --git a/packages/flutter_tools/test/integration.shard/test_data/test_project.dart b/packages/flutter_tools/test/integration.shard/test_data/test_project.dart
index 02b3c1a9a612..77b62a449825 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/test_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/test_project.dart
@@ -10,7 +10,7 @@ class TestProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=2.12.0-0 <3.0.0'
+    sdk: '>=2.12.0-0 <4.0.0'
 
   dependencies:
     flutter:
diff --git a/packages/flutter_tools/test/integration.shard/test_data/tests_project.dart b/packages/flutter_tools/test/integration.shard/test_data/tests_project.dart
index 80984677ee8a..308e16a38fa0 100644
--- a/packages/flutter_tools/test/integration.shard/test_data/tests_project.dart
+++ b/packages/flutter_tools/test/integration.shard/test_data/tests_project.dart
@@ -13,7 +13,7 @@ class TestsProject extends Project {
   final String pubspec = '''
   name: test
   environment:
-    sdk: '>=2.12.0-0 <3.0.0'
+    sdk: '>=2.12.0-0 <4.0.0'
 
   dependencies:
     flutter:
diff --git a/packages/flutter_tools/test/integration.shard/web_plugin_registrant_test.dart b/packages/flutter_tools/test/integration.shard/web_plugin_registrant_test.dart
index 3702715601e0..9477b7d8ac4f 100644
--- a/packages/flutter_tools/test/integration.shard/web_plugin_registrant_test.dart
+++ b/packages/flutter_tools/test/integration.shard/web_plugin_registrant_test.dart
@@ -80,19 +80,17 @@ void main() {
     ),
   });
 
-  testUsingContext('generated plugin registrant passes analysis without null safety', () async {
+  testUsingContext('generated plugin registrant passes analysis with null safety', () async {
     await _createProject(projectDir, <String>[]);
     // We need a dependency so the plugin registrant is not completely empty.
     await _editPubspecFile(projectDir,
       _composeEditors(<PubspecEditor>[
         _addDependencyEditor('shared_preferences', version: '^2.0.0'),
 
-        // This turns null safety off
-        _setDartSDKVersionEditor('>=2.11.0 <3.0.0'),
+        _setDartSDKVersionEditor('>=2.12.0 <4.0.0'),
       ]));
 
-    // The generated main.dart file has a bunch of stuff that is invalid without null safety, so
-    // replace it with a no-op dummy main file. We aren't testing it in this scenario anyway.
+    // Replace main file with a no-op dummy. We aren't testing it in this scenario anyway.
     await _replaceMainFile(projectDir, 'void main() {}');
 
     // The plugin registrant is created on build...
diff --git a/packages/flutter_web_plugins/pubspec.yaml b/packages/flutter_web_plugins/pubspec.yaml
index ab20c5183ce8..d6e576b9078d 100644
--- a/packages/flutter_web_plugins/pubspec.yaml
+++ b/packages/flutter_web_plugins/pubspec.yaml
@@ -3,7 +3,7 @@ description: Library to register Flutter Web plugins
 homepage: https://flutter.dev
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/packages/fuchsia_remote_debug_protocol/pubspec.yaml b/packages/fuchsia_remote_debug_protocol/pubspec.yaml
index f99f50e4af27..1eb33b077adc 100644
--- a/packages/fuchsia_remote_debug_protocol/pubspec.yaml
+++ b/packages/fuchsia_remote_debug_protocol/pubspec.yaml
@@ -4,7 +4,7 @@ description: Provides an API to test/debug Flutter applications on remote Fuchsi
 homepage: https://flutter.dev
 
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: '>=2.12.0-0 <4.0.0'
 
 dependencies:
   process: 4.2.4
diff --git a/packages/integration_test/example/pubspec.yaml b/packages/integration_test/example/pubspec.yaml
index 44957a65ec7b..a4781a35c6c8 100644
--- a/packages/integration_test/example/pubspec.yaml
+++ b/packages/integration_test/example/pubspec.yaml
@@ -3,7 +3,7 @@ description: Demonstrates how to use the integration_test plugin.
 publish_to: 'none'
 
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: '>=2.12.0-0 <4.0.0'
   flutter: ">=1.6.7"
 
 dependencies:
diff --git a/packages/integration_test/integration_test_macos/pubspec.yaml b/packages/integration_test/integration_test_macos/pubspec.yaml
index 1860af770601..ae3911318eb6 100644
--- a/packages/integration_test/integration_test_macos/pubspec.yaml
+++ b/packages/integration_test/integration_test_macos/pubspec.yaml
@@ -10,7 +10,7 @@ flutter:
         pluginClass: IntegrationTestPlugin
 
 environment:
-  sdk: ">=2.17.0-0 <3.0.0"
+  sdk: ">=2.17.0-0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/packages/integration_test/pubspec.yaml b/packages/integration_test/pubspec.yaml
index f2215ab4de66..245862d4ea40 100644
--- a/packages/integration_test/pubspec.yaml
+++ b/packages/integration_test/pubspec.yaml
@@ -3,7 +3,7 @@ description: Runs tests that use the flutter_test API as integration tests.
 publish_to: none
 
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: '>=2.12.0-0 <4.0.0'
 
 dependencies:
   flutter: