Bump SDK version
diff --git a/packages/connectivity/connectivity/CHANGELOG.md b/packages/connectivity/connectivity/CHANGELOG.md
index cc6897b..76925c1 100644
--- a/packages/connectivity/connectivity/CHANGELOG.md
+++ b/packages/connectivity/connectivity/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 3.0.0-nullsafety.1
+
+* Bump Dart SDK to support null safety.
+
 ## 3.0.0-nullsafety
 
 * Migrate to null safety.
diff --git a/packages/connectivity/connectivity/pubspec.yaml b/packages/connectivity/connectivity/pubspec.yaml
index 063b45e..a68ef36 100644
--- a/packages/connectivity/connectivity/pubspec.yaml
+++ b/packages/connectivity/connectivity/pubspec.yaml
@@ -2,7 +2,7 @@
 description: Flutter plugin for discovering the state of the network (WiFi &
   mobile/cellular) connectivity on Android and iOS.
 homepage: https://github.com/flutter/plugins/tree/master/packages/connectivity/connectivity
-version: 3.0.0-nullsafety
+version: 3.0.0-nullsafety.1
 
 flutter:
   plugin:
@@ -21,7 +21,7 @@
   flutter:
     sdk: flutter
   meta: ^1.0.5
-  connectivity_platform_interface: 2.0.0-nullsafety
+  connectivity_platform_interface: 2.0.0-nullsafety.1
   #TODO(cyanglaz): re-endorse the below plugins when they have migrated to nnbd.
   # https://github.com/flutter/flutter/issues/68669
   connectivity_macos: ^0.1.0
@@ -36,9 +36,9 @@
   integration_test:
     path: ../../integration_test
   mockito: ^4.1.1
-  plugin_platform_interface: 1.1.0-nullsafety
+  plugin_platform_interface: 1.1.0-nullsafety.1
   pedantic: ^1.10.0-nullsafety.1
 
 environment:
-  sdk: '>=2.10.0-56.0.dev <3.0.0'
+  sdk: '>=2.12.0-0 <3.0.0'
   flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/connectivity/connectivity_platform_interface/CHANGELOG.md b/packages/connectivity/connectivity_platform_interface/CHANGELOG.md
index dec2752..39275bf 100644
--- a/packages/connectivity/connectivity_platform_interface/CHANGELOG.md
+++ b/packages/connectivity/connectivity_platform_interface/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.0.0-nullsafety.1
+
+* Bump Dart SDK to support null safety.
+
 ## 2.0.0-nullsafety
 
 * Migrate to null safety.
diff --git a/packages/connectivity/connectivity_platform_interface/pubspec.yaml b/packages/connectivity/connectivity_platform_interface/pubspec.yaml
index f26107c..f9b7c87 100644
--- a/packages/connectivity/connectivity_platform_interface/pubspec.yaml
+++ b/packages/connectivity/connectivity_platform_interface/pubspec.yaml
@@ -3,13 +3,13 @@
 homepage: https://github.com/flutter/plugins/tree/master/packages/connectivity/connectivity_platform_interface
 # NOTE: We strongly prefer non-breaking changes, even at the expense of a
 # less-clean API. See https://flutter.dev/go/platform-interface-breaking-changes
-version: 2.0.0-nullsafety
+version: 2.0.0-nullsafety.1
 
 dependencies:
   flutter:
     sdk: flutter
   meta: ^1.3.0-nullsafety.3
-  plugin_platform_interface: 1.1.0-nullsafety
+  plugin_platform_interface: 1.1.0-nullsafety.1
 
 dev_dependencies:
   flutter_test:
@@ -17,5 +17,5 @@
   pedantic: ^1.10.0-nullsafety.1
 
 environment:
-  sdk: '>=2.10.0-56.0.dev <3.0.0'
+  sdk: '>=2.12.0-0 <3.0.0'
   flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/device_info/device_info/CHANGELOG.md b/packages/device_info/device_info/CHANGELOG.md
index 763fd9f..7437609 100644
--- a/packages/device_info/device_info/CHANGELOG.md
+++ b/packages/device_info/device_info/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.0.0-nullsafety.1
+
+* Bump Dart SDK to support null safety.
+
 ## 2.0.0-nullsafety
 
 * Migrate to null safety.
diff --git a/packages/device_info/device_info/pubspec.yaml b/packages/device_info/device_info/pubspec.yaml
index fed08f9..8c3831b 100644
--- a/packages/device_info/device_info/pubspec.yaml
+++ b/packages/device_info/device_info/pubspec.yaml
@@ -5,7 +5,7 @@
 # 0.4.y+z is compatible with 1.0.0, if you land a breaking change bump
 # the version to 2.0.0.
 # See more details: https://github.com/flutter/flutter/wiki/Package-migration-to-1.0.0
-version: 2.0.0-nullsafety
+version: 2.0.0-nullsafety.1
 
 flutter:
   plugin:
@@ -19,7 +19,7 @@
 dependencies:
   flutter:
     sdk: flutter
-  device_info_platform_interface: ^2.0.0-nullsafety
+  device_info_platform_interface: ^2.0.0-nullsafety.1
 dev_dependencies:
   test: ^1.10.0-nullsafety.1
   flutter_test:
diff --git a/packages/device_info/device_info_platform_interface/CHANGELOG.md b/packages/device_info/device_info_platform_interface/CHANGELOG.md
index fe9ded6..c25b22e 100644
--- a/packages/device_info/device_info_platform_interface/CHANGELOG.md
+++ b/packages/device_info/device_info_platform_interface/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.0.0-nullsafety.1
+
+* Bump Dart SDK to support null safety.
+
 ## 2.0.0-nullsafety
 
 * Migrate to null safety.
diff --git a/packages/device_info/device_info_platform_interface/pubspec.yaml b/packages/device_info/device_info_platform_interface/pubspec.yaml
index d9c3264..a52355f 100644
--- a/packages/device_info/device_info_platform_interface/pubspec.yaml
+++ b/packages/device_info/device_info_platform_interface/pubspec.yaml
@@ -3,13 +3,13 @@
 homepage: https://github.com/flutter/plugins/tree/master/packages/device_info
 # NOTE: We strongly prefer non-breaking changes, even at the expense of a
 # less-clean API. See https://flutter.dev/go/platform-interface-breaking-changes
-version: 2.0.0-nullsafety
+version: 2.0.0-nullsafety.1
 
 dependencies:
   flutter:
     sdk: flutter
   meta: ^1.3.0-nullsafety.3
-  plugin_platform_interface: 1.1.0-nullsafety
+  plugin_platform_interface: 1.1.0-nullsafety.1
 
 dev_dependencies:
   flutter_test:
@@ -18,5 +18,5 @@
   pedantic: ^1.10.0-nullsafety.1
 
 environment:
-  sdk: '>=2.10.0-56.0.dev <3.0.0'
+  sdk: '>=2.12.0-0 <3.0.0'
   flutter: ">=1.9.1+hotfix.4 <2.0.0"
diff --git a/packages/plugin_platform_interface/CHANGELOG.md b/packages/plugin_platform_interface/CHANGELOG.md
index f8e8485..7df1834 100644
--- a/packages/plugin_platform_interface/CHANGELOG.md
+++ b/packages/plugin_platform_interface/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.1.0-nullsafety.1
+
+* Bump Dart SDK to support null safety.
+
 ## 1.1.0-nullsafety
 
 * Migrate to null safety.
diff --git a/packages/plugin_platform_interface/pubspec.yaml b/packages/plugin_platform_interface/pubspec.yaml
index d79dbb8..66a3b6c 100644
--- a/packages/plugin_platform_interface/pubspec.yaml
+++ b/packages/plugin_platform_interface/pubspec.yaml
@@ -12,12 +12,12 @@
 # be done when absolutely necessary and after the ecosystem has already migrated to 1.X.Y version
 # that is forward compatible with 2.0.0 (ideally the ecosystem have migrated to depend on:
 # `plugin_platform_interface: >=1.X.Y <3.0.0`).
-version: 1.1.0-nullsafety
+version: 1.1.0-nullsafety.1
 
 repository: https://github.com/flutter/plugins/tree/master/packages/plugin_platform_interface
 
 environment:
-  sdk: '>=2.10.0-56.0.dev <3.0.0'
+  sdk: '>=2.12.0-0 <3.0.0'
 
 dependencies:
   meta: ^1.3.0-nullsafety.3
diff --git a/packages/url_launcher/url_launcher/CHANGELOG.md b/packages/url_launcher/url_launcher/CHANGELOG.md
index 3b5fff1..dc4c4a6 100644
--- a/packages/url_launcher/url_launcher/CHANGELOG.md
+++ b/packages/url_launcher/url_launcher/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 6.0.0-nullsafety.1
+
+* Bump Dart SDK to support null safety.
+
 ## 6.0.0-nullsafety
 
 * Migrate to null safety.
diff --git a/packages/url_launcher/url_launcher/example/pubspec.yaml b/packages/url_launcher/url_launcher/example/pubspec.yaml
index 4a833f0..065c008 100644
--- a/packages/url_launcher/url_launcher/example/pubspec.yaml
+++ b/packages/url_launcher/url_launcher/example/pubspec.yaml
@@ -14,7 +14,7 @@
     sdk: flutter
   pedantic: ^1.10.0-nullsafety.1
   mockito: ^4.1.1
-  plugin_platform_interface: 1.1.0-nullsafety
+  plugin_platform_interface: 1.1.0-nullsafety.1
 
 flutter:
   uses-material-design: true
diff --git a/packages/url_launcher/url_launcher/pubspec.yaml b/packages/url_launcher/url_launcher/pubspec.yaml
index 0ec7409..104550c 100644
--- a/packages/url_launcher/url_launcher/pubspec.yaml
+++ b/packages/url_launcher/url_launcher/pubspec.yaml
@@ -2,7 +2,7 @@
 description: Flutter plugin for launching a URL on Android and iOS. Supports
   web, phone, SMS, and email schemes.
 homepage: https://github.com/flutter/plugins/tree/master/packages/url_launcher/url_launcher
-version: 6.0.0-nullsafety
+version: 6.0.0-nullsafety.1
 
 flutter:
   plugin:
@@ -42,9 +42,9 @@
     sdk: flutter
   test: ^1.10.0-nullsafety.1
   mockito: ^4.1.1
-  plugin_platform_interface: 1.1.0-nullsafety
+  plugin_platform_interface: 1.1.0-nullsafety.1
   pedantic: ^1.10.0-nullsafety.1
 
 environment:
-  sdk: ">=2.10.0-56.0.dev <3.0.0"
+  sdk: ">=2.12.0-0 <3.0.0"
   flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/url_launcher/url_launcher_linux/CHANGELOG.md b/packages/url_launcher/url_launcher_linux/CHANGELOG.md
index c850ba8..8525e1f 100644
--- a/packages/url_launcher/url_launcher_linux/CHANGELOG.md
+++ b/packages/url_launcher/url_launcher_linux/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 0.1.0-nullsafety
+## 0.1.0-nullsafety.1
 
 * Migrate to null safety.
 
diff --git a/packages/url_launcher/url_launcher_linux/pubspec.yaml b/packages/url_launcher/url_launcher_linux/pubspec.yaml
index e7ae1e8..3331a81 100644
--- a/packages/url_launcher/url_launcher_linux/pubspec.yaml
+++ b/packages/url_launcher/url_launcher_linux/pubspec.yaml
@@ -1,6 +1,6 @@
 name: url_launcher_linux
 description: Linux implementation of the url_launcher plugin.
-version: 0.1.0-nullsafety
+version: 0.1.0-nullsafety.1
 homepage: https://github.com/flutter/plugins/tree/master/packages/url_launcher/url_launcher_linux
 
 flutter:
@@ -10,7 +10,7 @@
         pluginClass: UrlLauncherPlugin
 
 environment:
-  sdk: ">=2.10.0-56.0.dev <3.0.0"
+  sdk: ">=2.12.0-0 <3.0.0"
   flutter: ">=1.12.8 <2.0.0"
 
 dependencies:
diff --git a/packages/url_launcher/url_launcher_macos/CHANGELOG.md b/packages/url_launcher/url_launcher_macos/CHANGELOG.md
index a43df45..a0e783b 100644
--- a/packages/url_launcher/url_launcher_macos/CHANGELOG.md
+++ b/packages/url_launcher/url_launcher_macos/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.1.0-nullsafety.1
+
+* Bump SDK to support null safety.
+
 # 0.1.0-nullsafety
 
 * Migrate to null safety.
diff --git a/packages/url_launcher/url_launcher_macos/pubspec.yaml b/packages/url_launcher/url_launcher_macos/pubspec.yaml
index 8c48c6d..bcb9589 100644
--- a/packages/url_launcher/url_launcher_macos/pubspec.yaml
+++ b/packages/url_launcher/url_launcher_macos/pubspec.yaml
@@ -3,7 +3,7 @@
 # 0.0.y+z is compatible with 1.0.0, if you land a breaking change bump
 # the version to 2.0.0.
 # See more details: https://github.com/flutter/flutter/wiki/Package-migration-to-1.0.0
-version: 0.1.0-nullsafety
+version: 0.1.0-nullsafety.1
 homepage: https://github.com/flutter/plugins/tree/master/packages/url_launcher/url_launcher_macos
 
 flutter:
@@ -14,7 +14,7 @@
         fileName: url_launcher_macos.dart
 
 environment:
-  sdk: ">=2.10.0-56.0.dev <3.0.0"
+  sdk: ">=2.12.0-0 <3.0.0"
   flutter: ">=1.12.8 <2.0.0"
 
 dependencies:
diff --git a/packages/url_launcher/url_launcher_platform_interface/CHANGELOG.md b/packages/url_launcher/url_launcher_platform_interface/CHANGELOG.md
index 74972e5..5029848 100644
--- a/packages/url_launcher/url_launcher_platform_interface/CHANGELOG.md
+++ b/packages/url_launcher/url_launcher_platform_interface/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.0.0-nullsafety.1
+
+* Bump Dart SDK to support null safety.
+
 ## 2.0.0-nullsafety
 
 * Migrate to null safety.
diff --git a/packages/url_launcher/url_launcher_platform_interface/pubspec.yaml b/packages/url_launcher/url_launcher_platform_interface/pubspec.yaml
index f5ea35d..2b5e67d 100644
--- a/packages/url_launcher/url_launcher_platform_interface/pubspec.yaml
+++ b/packages/url_launcher/url_launcher_platform_interface/pubspec.yaml
@@ -3,12 +3,12 @@
 homepage: https://github.com/flutter/plugins/tree/master/packages/url_launcher/url_launcher_platform_interface
 # NOTE: We strongly prefer non-breaking changes, even at the expense of a
 # less-clean API. See https://flutter.dev/go/platform-interface-breaking-changes
-version: 2.0.0-nullsafety
+version: 2.0.0-nullsafety.1
 
 dependencies:
   flutter:
     sdk: flutter
-  plugin_platform_interface: 1.1.0-nullsafety
+  plugin_platform_interface: 1.1.0-nullsafety.1
 
 dev_dependencies:
   flutter_test:
@@ -17,5 +17,5 @@
   pedantic: ^1.10.0-nullsafety.1
 
 environment:
-  sdk: '>=2.10.0-56.0.dev <3.0.0'
+  sdk: '>=2.12.0-0 <3.0.0'
   flutter: ">=1.9.1+hotfix.4 <2.0.0"
diff --git a/packages/url_launcher/url_launcher_windows/CHANGELOG.md b/packages/url_launcher/url_launcher_windows/CHANGELOG.md
index a8748a3..ef15cf2 100644
--- a/packages/url_launcher/url_launcher_windows/CHANGELOG.md
+++ b/packages/url_launcher/url_launcher_windows/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.1.0-nullsafety.1
+
+* Bump Dart SDK to support null safety.
+
 ## 0.1.0-nullsafety
 
 * Migrate to null-safety.
diff --git a/packages/url_launcher/url_launcher_windows/pubspec.yaml b/packages/url_launcher/url_launcher_windows/pubspec.yaml
index 39ea2d2..31ce992 100644
--- a/packages/url_launcher/url_launcher_windows/pubspec.yaml
+++ b/packages/url_launcher/url_launcher_windows/pubspec.yaml
@@ -3,7 +3,7 @@
 # 0.0.y+z is compatible with 1.0.0, if you land a breaking change bump
 # the version to 2.0.0.
 # See more details: https://github.com/flutter/flutter/wiki/Package-migration-to-1.0.0
-version: 0.1.0-nullsafety
+version: 0.1.0-nullsafety.1
 homepage: https://github.com/flutter/plugins/tree/master/packages/url_launcher/url_launcher_windows
 
 flutter:
@@ -13,7 +13,7 @@
         pluginClass: UrlLauncherPlugin
 
 environment:
-  sdk: ">=2.10.0-56.0.dev <3.0.0"
+  sdk: ">=2.12.0-0 <3.0.0"
   flutter: ">=1.12.8 <2.0.0"
 
 dependencies:
diff --git a/packages/video_player/video_player/pubspec.yaml b/packages/video_player/video_player/pubspec.yaml
index cfefaad..6e40db7 100644
--- a/packages/video_player/video_player/pubspec.yaml
+++ b/packages/video_player/video_player/pubspec.yaml
@@ -4,7 +4,7 @@
 # 0.10.y+z is compatible with 1.0.0, if you land a breaking change bump
 # the version to 2.0.0.
 # See more details: https://github.com/flutter/flutter/wiki/Package-migration-to-1.0.0
-version: 2.0.0-nullsafety.1
+version: 2.0.0-nullsafety.2
 homepage: https://github.com/flutter/plugins/tree/master/packages/video_player/video_player
 
 flutter:
@@ -20,14 +20,14 @@
 
 dependencies:
   meta: ^1.3.0-nullsafety.3
-  video_player_platform_interface: ^3.0.0-nullsafety.1
+  video_player_platform_interface: ^3.0.0-nullsafety.2
 
   # The design on https://flutter.dev/go/federated-plugins was to leave
   # this constraint as "any". We cannot do it right now as it fails pub publish
   # validation, so we set a ^ constraint.
   # TODO(amirh): Revisit this (either update this part in the  design or the pub tool).
   # https://github.com/flutter/flutter/issues/46264
-  video_player_web: ^2.0.0-nullsafety
+  video_player_web: ^2.0.0-nullsafety.1
 
   flutter:
     sdk: flutter
@@ -39,5 +39,5 @@
   pigeon: 0.1.7
 
 environment:
-  sdk: '>=2.10.0-56.0.dev <3.0.0'
+  sdk: '>=2.12.0-0 <3.0.0'
   flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/video_player/video_player_platform_interface/CHANGELOG.md b/packages/video_player/video_player_platform_interface/CHANGELOG.md
index 1522d2b..880f818 100644
--- a/packages/video_player/video_player_platform_interface/CHANGELOG.md
+++ b/packages/video_player/video_player_platform_interface/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 3.0.0-nullsafety.2
+
+* Bump Dart SDK to support null safety.
+
 ## 3.0.0-nullsafety.1
 
 * Make DataSource's `uri` parameter nullable.
diff --git a/packages/video_player/video_player_platform_interface/pubspec.yaml b/packages/video_player/video_player_platform_interface/pubspec.yaml
index 7394a33..7713723 100644
--- a/packages/video_player/video_player_platform_interface/pubspec.yaml
+++ b/packages/video_player/video_player_platform_interface/pubspec.yaml
@@ -3,7 +3,7 @@
 homepage: https://github.com/flutter/plugins/tree/master/packages/video_player/video_player_platform_interface
 # NOTE: We strongly prefer non-breaking changes, even at the expense of a
 # less-clean API. See https://flutter.dev/go/platform-interface-breaking-changes
-version: 3.0.0-nullsafety.1
+version: 3.0.0-nullsafety.2
 
 dependencies:
   flutter:
@@ -17,5 +17,5 @@
   pedantic: ^1.10.0-nullsafety.1
 
 environment:
-  sdk: ">=2.10.0-56.0.dev <3.0.0"
+  sdk: ">=2.12.0-0 <3.0.0"
   flutter: ">=1.10.0 <2.0.0"
diff --git a/packages/video_player/video_player_web/CHANGELOG.md b/packages/video_player/video_player_web/CHANGELOG.md
index d035810..6b38dbd 100644
--- a/packages/video_player/video_player_web/CHANGELOG.md
+++ b/packages/video_player/video_player_web/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.0.0-nullsafety.1
+
+* Bump Dart SDK to support null safety.
+
 ## 2.0.0-nullsafety
 
 * Migrate to null safety.
diff --git a/packages/video_player/video_player_web/pubspec.yaml b/packages/video_player/video_player_web/pubspec.yaml
index 6538bbc..098c9f5 100644
--- a/packages/video_player/video_player_web/pubspec.yaml
+++ b/packages/video_player/video_player_web/pubspec.yaml
@@ -4,7 +4,7 @@
 # 0.1.y+z is compatible with 1.0.0, if you land a breaking change bump
 # the version to 2.0.0.
 # See more details: https://github.com/flutter/flutter/wiki/Package-migration-to-1.0.0
-version: 2.0.0-nullsafety
+version: 2.0.0-nullsafety.1
 
 flutter:
   plugin:
@@ -29,5 +29,5 @@
   pedantic: ^1.10.0-nullsafety.1
 
 environment:
-  sdk: '>=2.10.0-56.0.dev <3.0.0'
+  sdk: '>=2.12.0-0 <3.0.0'
   flutter: ">=1.12.13+hotfix.5 <2.0.0"