diff --git a/packages/android_alarm_manager/CHANGELOG.md b/packages/android_alarm_manager/CHANGELOG.md
index ab878a6562f4..023a140fbcc9 100644
--- a/packages/android_alarm_manager/CHANGELOG.md
+++ b/packages/android_alarm_manager/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.4.5+17
+
+* Update Dart SDK constraint in example.
+
 ## 0.4.5+16
 
 * Remove unnecessary workaround from test.
diff --git a/packages/android_alarm_manager/example/pubspec.yaml b/packages/android_alarm_manager/example/pubspec.yaml
index 93cbc57d8de5..e636a246376b 100644
--- a/packages/android_alarm_manager/example/pubspec.yaml
+++ b/packages/android_alarm_manager/example/pubspec.yaml
@@ -21,3 +21,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/android_alarm_manager/pubspec.yaml b/packages/android_alarm_manager/pubspec.yaml
index 80327326fb8a..9de2d8308419 100644
--- a/packages/android_alarm_manager/pubspec.yaml
+++ b/packages/android_alarm_manager/pubspec.yaml
@@ -4,7 +4,7 @@ description: Flutter plugin for accessing the Android AlarmManager service, and
 # 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: 0.4.5+16
+version: 0.4.5+17
 homepage: https://github.com/flutter/plugins/tree/master/packages/android_alarm_manager
 
 dependencies:
diff --git a/packages/android_intent/CHANGELOG.md b/packages/android_intent/CHANGELOG.md
index 5f01fc9298c7..5a3ba03b33eb 100644
--- a/packages/android_intent/CHANGELOG.md
+++ b/packages/android_intent/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.3.7+7
+
+* Update Dart SDK constraint in example.
+
 ## 0.3.7+6
 
 * Update android compileSdkVersion to 29.
diff --git a/packages/android_intent/example/pubspec.yaml b/packages/android_intent/example/pubspec.yaml
index 31d434e8c038..84455d99e618 100644
--- a/packages/android_intent/example/pubspec.yaml
+++ b/packages/android_intent/example/pubspec.yaml
@@ -17,3 +17,7 @@ dev_dependencies:
 # The following section is specific to Flutter.
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.3.0 <3.0.0"
+  flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/android_intent/pubspec.yaml b/packages/android_intent/pubspec.yaml
index fef90e2f7602..8d41d5165c68 100644
--- a/packages/android_intent/pubspec.yaml
+++ b/packages/android_intent/pubspec.yaml
@@ -4,7 +4,7 @@ homepage: https://github.com/flutter/plugins/tree/master/packages/android_intent
 # 0.3.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: 0.3.7+6
+version: 0.3.7+7
 
 flutter:
   plugin:
diff --git a/packages/battery/battery/CHANGELOG.md b/packages/battery/battery/CHANGELOG.md
index 8a38fde5d937..260f3efeb8ad 100644
--- a/packages/battery/battery/CHANGELOG.md
+++ b/packages/battery/battery/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.0.8
+
+* Update Dart SDK constraint in example.
+
 ## 1.0.7
 
 * Update android compileSdkVersion to 29.
diff --git a/packages/battery/battery/example/pubspec.yaml b/packages/battery/battery/example/pubspec.yaml
index e7a9b1c8b74d..4e7b9ef035eb 100644
--- a/packages/battery/battery/example/pubspec.yaml
+++ b/packages/battery/battery/example/pubspec.yaml
@@ -16,3 +16,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/battery/battery/pubspec.yaml b/packages/battery/battery/pubspec.yaml
index d841805c7612..ec747190ac69 100644
--- a/packages/battery/battery/pubspec.yaml
+++ b/packages/battery/battery/pubspec.yaml
@@ -2,7 +2,7 @@ name: battery
 description: Flutter plugin for accessing information about the battery state
   (full, charging, discharging) on Android and iOS.
 homepage: https://github.com/flutter/plugins/tree/master/packages/battery/battery
-version: 1.0.7
+version: 1.0.8
 
 flutter:
   plugin:
diff --git a/packages/connectivity/connectivity/CHANGELOG.md b/packages/connectivity/connectivity/CHANGELOG.md
index 8e2802ab5b04..829373db774c 100644
--- a/packages/connectivity/connectivity/CHANGELOG.md
+++ b/packages/connectivity/connectivity/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.0.1
+
+* Update Dart SDK constraint in example.
+
 ## 2.0.0
 
 * [Breaking Change] The `getWifiName`, `getWifiBSSID` and `getWifiIP` are removed to [wifi_info_flutter](https://github.com/flutter/plugins/tree/master/packages/wifi_info_flutter)
diff --git a/packages/connectivity/connectivity/example/pubspec.yaml b/packages/connectivity/connectivity/example/pubspec.yaml
index 1d07f7d19e60..afa3325952e3 100644
--- a/packages/connectivity/connectivity/example/pubspec.yaml
+++ b/packages/connectivity/connectivity/example/pubspec.yaml
@@ -17,3 +17,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/connectivity/connectivity/pubspec.yaml b/packages/connectivity/connectivity/pubspec.yaml
index af26f703d8b9..597222b505ec 100644
--- a/packages/connectivity/connectivity/pubspec.yaml
+++ b/packages/connectivity/connectivity/pubspec.yaml
@@ -2,7 +2,7 @@ name: connectivity
 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: 2.0.0
+version: 2.0.1
 
 flutter:
   plugin:
diff --git a/packages/connectivity/connectivity_macos/CHANGELOG.md b/packages/connectivity/connectivity_macos/CHANGELOG.md
index e997123ecc89..ac9dc77517ec 100644
--- a/packages/connectivity/connectivity_macos/CHANGELOG.md
+++ b/packages/connectivity/connectivity_macos/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.1.0+7
+
+* Update Dart SDK constraint in example.
+
 ## 0.1.0+6
 
 * Update license headers.
diff --git a/packages/connectivity/connectivity_macos/example/pubspec.yaml b/packages/connectivity/connectivity_macos/example/pubspec.yaml
index 7faf3e2f67e7..62f2e8129ed8 100644
--- a/packages/connectivity/connectivity_macos/example/pubspec.yaml
+++ b/packages/connectivity/connectivity_macos/example/pubspec.yaml
@@ -18,3 +18,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.10.0 <2.0.0"
diff --git a/packages/connectivity/connectivity_macos/pubspec.yaml b/packages/connectivity/connectivity_macos/pubspec.yaml
index 99151ff7418d..2ab493072f8c 100644
--- a/packages/connectivity/connectivity_macos/pubspec.yaml
+++ b/packages/connectivity/connectivity_macos/pubspec.yaml
@@ -3,7 +3,7 @@ description: macOS implementation of the connectivity plugin.
 # 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: 0.1.0+6
+version: 0.1.0+7
 homepage: https://github.com/flutter/plugins/tree/master/packages/connectivity/connectivity_macos
 
 flutter:
diff --git a/packages/device_info/device_info/CHANGELOG.md b/packages/device_info/device_info/CHANGELOG.md
index 836d56232f95..b346c2d5db66 100644
--- a/packages/device_info/device_info/CHANGELOG.md
+++ b/packages/device_info/device_info/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.4.2+10
+
+* Update Dart SDK constraint in example.
+
 ## 0.4.2+9
 
 * Update android compileSdkVersion to 29.
diff --git a/packages/device_info/device_info/example/lib/main.dart b/packages/device_info/device_info/example/lib/main.dart
index 1c1064aa09ee..63912b37c3ce 100644
--- a/packages/device_info/device_info/example/lib/main.dart
+++ b/packages/device_info/device_info/example/lib/main.dart
@@ -12,9 +12,9 @@ import 'package:flutter/services.dart';
 import 'package:device_info/device_info.dart';
 
 void main() {
-  runZoned(() {
+  runZonedGuarded(() {
     runApp(MyApp());
-  }, onError: (dynamic error, dynamic stack) {
+  }, (dynamic error, dynamic stack) {
     print(error);
     print(stack);
   });
diff --git a/packages/device_info/device_info/example/pubspec.yaml b/packages/device_info/device_info/example/pubspec.yaml
index e22f6026ba69..58d54cba6d70 100644
--- a/packages/device_info/device_info/example/pubspec.yaml
+++ b/packages/device_info/device_info/example/pubspec.yaml
@@ -16,3 +16,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0<3.0.0"
+  flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/device_info/device_info/pubspec.yaml b/packages/device_info/device_info/pubspec.yaml
index bf36bf6f34d9..f041e3e6374d 100644
--- a/packages/device_info/device_info/pubspec.yaml
+++ b/packages/device_info/device_info/pubspec.yaml
@@ -5,7 +5,7 @@ homepage: https://github.com/flutter/plugins/tree/master/packages/device_info
 # 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: 0.4.2+9
+version: 0.4.2+10
 
 flutter:
   plugin:
diff --git a/packages/google_maps_flutter/google_maps_flutter/CHANGELOG.md b/packages/google_maps_flutter/google_maps_flutter/CHANGELOG.md
index a2e0c1bc3df6..7cdd6313f480 100644
--- a/packages/google_maps_flutter/google_maps_flutter/CHANGELOG.md
+++ b/packages/google_maps_flutter/google_maps_flutter/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.0.6
+
+* Update Dart SDK constraint in example.
+
 ## 1.0.5
 
 Overhaul lifecycle management in GoogleMapsPlugin.
diff --git a/packages/google_maps_flutter/google_maps_flutter/example/pubspec.yaml b/packages/google_maps_flutter/google_maps_flutter/example/pubspec.yaml
index 7bfc7a6feb9c..9f499fb7c80c 100644
--- a/packages/google_maps_flutter/google_maps_flutter/example/pubspec.yaml
+++ b/packages/google_maps_flutter/google_maps_flutter/example/pubspec.yaml
@@ -1,6 +1,10 @@
 name: google_maps_flutter_example
 description: Demonstrates how to use the google_maps_flutter plugin.
 
+environment:
+  sdk: ">=2.2.0 <3.0.0"
+  flutter: ">=1.22.0 <2.0.0"
+
 dependencies:
   flutter:
     sdk: flutter
diff --git a/packages/google_maps_flutter/google_maps_flutter/pubspec.yaml b/packages/google_maps_flutter/google_maps_flutter/pubspec.yaml
index dadedb8cce3b..2e4ae9dca5d1 100644
--- a/packages/google_maps_flutter/google_maps_flutter/pubspec.yaml
+++ b/packages/google_maps_flutter/google_maps_flutter/pubspec.yaml
@@ -1,7 +1,7 @@
 name: google_maps_flutter
 description: A Flutter plugin for integrating Google Maps in iOS and Android applications.
 homepage: https://github.com/flutter/plugins/tree/master/packages/google_maps_flutter/google_maps_flutter
-version: 1.0.5
+version: 1.0.6
 
 dependencies:
   flutter:
diff --git a/packages/local_auth/CHANGELOG.md b/packages/local_auth/CHANGELOG.md
index 57295ab32012..96388a76ab4f 100644
--- a/packages/local_auth/CHANGELOG.md
+++ b/packages/local_auth/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.6.3+4
+
+* Update Dart SDK constraint in example.
+
 ## 0.6.3+3
 
 * Update android compileSdkVersion to 29.
diff --git a/packages/local_auth/example/pubspec.yaml b/packages/local_auth/example/pubspec.yaml
index 8d17a43efb26..0861c51adbc6 100644
--- a/packages/local_auth/example/pubspec.yaml
+++ b/packages/local_auth/example/pubspec.yaml
@@ -16,3 +16,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/local_auth/pubspec.yaml b/packages/local_auth/pubspec.yaml
index 9505c774e24d..6ba77aca6679 100644
--- a/packages/local_auth/pubspec.yaml
+++ b/packages/local_auth/pubspec.yaml
@@ -2,7 +2,7 @@ name: local_auth
 description: Flutter plugin for Android and iOS device authentication sensors
   such as Fingerprint Reader and Touch ID.
 homepage: https://github.com/flutter/plugins/tree/master/packages/local_auth
-version: 0.6.3+3
+version: 0.6.3+4
 
 flutter:
   plugin:
diff --git a/packages/package_info/CHANGELOG.md b/packages/package_info/CHANGELOG.md
index 535232fbcd97..817a24a91aaf 100644
--- a/packages/package_info/CHANGELOG.md
+++ b/packages/package_info/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.4.3+2
+
+* Update Dart SDK constraint in example.
+
 ## 0.4.3+1
 
 * Update android compileSdkVersion to 29.
diff --git a/packages/package_info/example/pubspec.yaml b/packages/package_info/example/pubspec.yaml
index a6dbbce44811..a7c15bb976d4 100644
--- a/packages/package_info/example/pubspec.yaml
+++ b/packages/package_info/example/pubspec.yaml
@@ -17,3 +17,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/package_info/pubspec.yaml b/packages/package_info/pubspec.yaml
index 16349a619986..425a6da3c091 100644
--- a/packages/package_info/pubspec.yaml
+++ b/packages/package_info/pubspec.yaml
@@ -5,7 +5,7 @@ homepage: https://github.com/flutter/plugins/tree/master/packages/package_info
 # 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: 0.4.3+1
+version: 0.4.3+2
 
 flutter:
   plugin:
diff --git a/packages/path_provider/path_provider/CHANGELOG.md b/packages/path_provider/path_provider/CHANGELOG.md
index ceb2a19187b9..74dfa8ae5086 100644
--- a/packages/path_provider/path_provider/CHANGELOG.md
+++ b/packages/path_provider/path_provider/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.6.24
+
+* Update Dart SDK constraint in example.
+
 ## 1.6.23
 
 * Check in windows/ directory for example/
diff --git a/packages/path_provider/path_provider/example/pubspec.yaml b/packages/path_provider/path_provider/example/pubspec.yaml
index 983b3b82eb53..8f8bf9a536f1 100644
--- a/packages/path_provider/path_provider/example/pubspec.yaml
+++ b/packages/path_provider/path_provider/example/pubspec.yaml
@@ -17,3 +17,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/path_provider/path_provider/pubspec.yaml b/packages/path_provider/path_provider/pubspec.yaml
index 3fda0dcf1458..7afcd04695d1 100644
--- a/packages/path_provider/path_provider/pubspec.yaml
+++ b/packages/path_provider/path_provider/pubspec.yaml
@@ -1,7 +1,7 @@
 name: path_provider
 description: Flutter plugin for getting commonly used locations on host platform file systems, such as the temp and app data directories.
 homepage: https://github.com/flutter/plugins/tree/master/packages/path_provider/path_provider
-version: 1.6.23
+version: 1.6.24
 
 flutter:
   plugin:
diff --git a/packages/path_provider/path_provider_macos/CHANGELOG.md b/packages/path_provider/path_provider_macos/CHANGELOG.md
index b2ca95fbd10c..dbee1c02dddf 100644
--- a/packages/path_provider/path_provider_macos/CHANGELOG.md
+++ b/packages/path_provider/path_provider_macos/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.0.4+6
+
+* Update Dart SDK constraint in example.
+
 ## 0.0.4+5
 
 * Update license header.
diff --git a/packages/path_provider/path_provider_macos/example/pubspec.yaml b/packages/path_provider/path_provider_macos/example/pubspec.yaml
index aaa6842651b5..cd940c1df911 100644
--- a/packages/path_provider/path_provider_macos/example/pubspec.yaml
+++ b/packages/path_provider/path_provider_macos/example/pubspec.yaml
@@ -22,3 +22,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.10.0 <2.0.0"
diff --git a/packages/path_provider/path_provider_macos/pubspec.yaml b/packages/path_provider/path_provider_macos/pubspec.yaml
index 970c8c59fe7a..69241491d29d 100644
--- a/packages/path_provider/path_provider_macos/pubspec.yaml
+++ b/packages/path_provider/path_provider_macos/pubspec.yaml
@@ -3,7 +3,7 @@ description: macOS implementation of the path_provider plugin
 # 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: 0.0.4+5
+version: 0.0.4+6
 homepage: https://github.com/flutter/plugins/tree/master/packages/path_provider/path_provider_macos
 
 flutter:
diff --git a/packages/path_provider/path_provider_windows/CHANGELOG.md b/packages/path_provider/path_provider_windows/CHANGELOG.md
index e142c512d298..a28e47a8bb89 100644
--- a/packages/path_provider/path_provider_windows/CHANGELOG.md
+++ b/packages/path_provider/path_provider_windows/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.0.4+3
+
+* Update Dart SDK constraint in example.
+
 ## 0.0.4+2
 
 * Check in windows/ directory for example/
diff --git a/packages/path_provider/path_provider_windows/example/pubspec.yaml b/packages/path_provider/path_provider_windows/example/pubspec.yaml
index 8dbe6e020906..e940493df05e 100644
--- a/packages/path_provider/path_provider_windows/example/pubspec.yaml
+++ b/packages/path_provider/path_provider_windows/example/pubspec.yaml
@@ -19,3 +19,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.12.13+hotfix.4 <2.0.0"
diff --git a/packages/path_provider/path_provider_windows/pubspec.yaml b/packages/path_provider/path_provider_windows/pubspec.yaml
index 8aa1af58a50f..342774680dc4 100644
--- a/packages/path_provider/path_provider_windows/pubspec.yaml
+++ b/packages/path_provider/path_provider_windows/pubspec.yaml
@@ -1,7 +1,7 @@
 name: path_provider_windows
 description: Windows implementation of the path_provider plugin
 homepage: https://github.com/flutter/plugins/tree/master/packages/path_provider/path_provider_windows
-version: 0.0.4+2
+version: 0.0.4+3
 
 flutter:
   plugin:
diff --git a/packages/shared_preferences/shared_preferences_linux/CHANGELOG.md b/packages/shared_preferences/shared_preferences_linux/CHANGELOG.md
index e6d98c7ba333..55bf6a4f73a4 100644
--- a/packages/shared_preferences/shared_preferences_linux/CHANGELOG.md
+++ b/packages/shared_preferences/shared_preferences_linux/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.0.2+4
+
+* Update Dart SDK constraint in example.
+
 ## 0.0.2+3
 
 * Check in linux/ directory for example/
diff --git a/packages/shared_preferences/shared_preferences_linux/example/pubspec.yaml b/packages/shared_preferences/shared_preferences_linux/example/pubspec.yaml
index 5936e3ace02f..bed5b25c4507 100644
--- a/packages/shared_preferences/shared_preferences_linux/example/pubspec.yaml
+++ b/packages/shared_preferences/shared_preferences_linux/example/pubspec.yaml
@@ -25,3 +25,6 @@ dev_dependencies:
 flutter:
   uses-material-design: true
 
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.12.8 <2.0.0"
diff --git a/packages/shared_preferences/shared_preferences_linux/pubspec.yaml b/packages/shared_preferences/shared_preferences_linux/pubspec.yaml
index 791515e669ad..380cee9efb1c 100644
--- a/packages/shared_preferences/shared_preferences_linux/pubspec.yaml
+++ b/packages/shared_preferences/shared_preferences_linux/pubspec.yaml
@@ -1,6 +1,6 @@
 name: shared_preferences_linux
 description: Linux implementation of the shared_preferences plugin
-version: 0.0.2+3
+version: 0.0.2+4
 homepage: https://github.com/flutter/plugins/tree/master/packages/shared_preferences/shared_preferences_linux
 
 flutter:
diff --git a/packages/shared_preferences/shared_preferences_macos/CHANGELOG.md b/packages/shared_preferences/shared_preferences_macos/CHANGELOG.md
index ae79f0169326..f80e129d834b 100644
--- a/packages/shared_preferences/shared_preferences_macos/CHANGELOG.md
+++ b/packages/shared_preferences/shared_preferences_macos/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.0.1+11
+
+* Update Dart SDK constraint in example.
+
 ## 0.0.1+10
 
 * Remove iOS and Android folders from the example app.
diff --git a/packages/shared_preferences/shared_preferences_macos/example/pubspec.yaml b/packages/shared_preferences/shared_preferences_macos/example/pubspec.yaml
index de4b6ed9d379..de0bee3330a9 100644
--- a/packages/shared_preferences/shared_preferences_macos/example/pubspec.yaml
+++ b/packages/shared_preferences/shared_preferences_macos/example/pubspec.yaml
@@ -19,3 +19,6 @@ dev_dependencies:
 flutter:
   uses-material-design: true
 
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.12.8 <2.0.0"
diff --git a/packages/shared_preferences/shared_preferences_macos/pubspec.yaml b/packages/shared_preferences/shared_preferences_macos/pubspec.yaml
index 5657b9e3200a..3c0deb3c675d 100644
--- a/packages/shared_preferences/shared_preferences_macos/pubspec.yaml
+++ b/packages/shared_preferences/shared_preferences_macos/pubspec.yaml
@@ -3,7 +3,7 @@ description: macOS implementation of the shared_preferences plugin.
 # 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: 0.0.1+10
+version: 0.0.1+11
 homepage: https://github.com/flutter/plugins/tree/master/packages/shared_preferences/shared_preferences_macos
 
 flutter:
diff --git a/packages/url_launcher/url_launcher/CHANGELOG.md b/packages/url_launcher/url_launcher/CHANGELOG.md
index 34b9dbf7913a..832c0c62f553 100644
--- a/packages/url_launcher/url_launcher/CHANGELOG.md
+++ b/packages/url_launcher/url_launcher/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 5.7.10
+
+* Update Dart SDK constraint in example.
+
 ## 5.7.9
 
 * Check in windows/ directory for example/
diff --git a/packages/url_launcher/url_launcher/example/pubspec.yaml b/packages/url_launcher/url_launcher/example/pubspec.yaml
index b48445c3a7e9..94df1a4b4959 100644
--- a/packages/url_launcher/url_launcher/example/pubspec.yaml
+++ b/packages/url_launcher/url_launcher/example/pubspec.yaml
@@ -18,3 +18,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/url_launcher/url_launcher/pubspec.yaml b/packages/url_launcher/url_launcher/pubspec.yaml
index 9299086a9046..7fa97388ef91 100644
--- a/packages/url_launcher/url_launcher/pubspec.yaml
+++ b/packages/url_launcher/url_launcher/pubspec.yaml
@@ -2,7 +2,7 @@ name: url_launcher
 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: 5.7.9
+version: 5.7.10
 
 flutter:
   plugin:
diff --git a/packages/url_launcher/url_launcher_linux/CHANGELOG.md b/packages/url_launcher/url_launcher_linux/CHANGELOG.md
index c6a00423e16a..e0a01ec629f5 100644
--- a/packages/url_launcher/url_launcher_linux/CHANGELOG.md
+++ b/packages/url_launcher/url_launcher_linux/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.0.1+4
+
+* Update Dart SDK constraint in example.
+
 ## 0.0.1+3
 
 * Add a missing include.
diff --git a/packages/url_launcher/url_launcher_linux/example/pubspec.yaml b/packages/url_launcher/url_launcher_linux/example/pubspec.yaml
index c9d0c32f5cb6..9604637c336c 100644
--- a/packages/url_launcher/url_launcher_linux/example/pubspec.yaml
+++ b/packages/url_launcher/url_launcher_linux/example/pubspec.yaml
@@ -17,3 +17,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.12.8 <2.0.0"
diff --git a/packages/url_launcher/url_launcher_linux/pubspec.yaml b/packages/url_launcher/url_launcher_linux/pubspec.yaml
index c4f6f8c70a73..16448e4020e5 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: 0.0.1+3
+version: 0.0.1+4
 homepage: https://github.com/flutter/plugins/tree/master/packages/url_launcher/url_launcher_linux
 
 flutter:
diff --git a/packages/url_launcher/url_launcher_macos/CHANGELOG.md b/packages/url_launcher/url_launcher_macos/CHANGELOG.md
index d52bf8c249e6..190aa2887353 100644
--- a/packages/url_launcher/url_launcher_macos/CHANGELOG.md
+++ b/packages/url_launcher/url_launcher_macos/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.0.1+9
+
+* Update Dart SDK constraint in example.
+
 # 0.0.1+8
 
 * Remove no-op android folder in the example app.
diff --git a/packages/url_launcher/url_launcher_macos/example/pubspec.yaml b/packages/url_launcher/url_launcher_macos/example/pubspec.yaml
index 0fab67e8af1b..dbf8951ff408 100644
--- a/packages/url_launcher/url_launcher_macos/example/pubspec.yaml
+++ b/packages/url_launcher/url_launcher_macos/example/pubspec.yaml
@@ -17,3 +17,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.12.8 <2.0.0"
diff --git a/packages/url_launcher/url_launcher_macos/pubspec.yaml b/packages/url_launcher/url_launcher_macos/pubspec.yaml
index 4775f23fe36a..1a77bc7aeab3 100644
--- a/packages/url_launcher/url_launcher_macos/pubspec.yaml
+++ b/packages/url_launcher/url_launcher_macos/pubspec.yaml
@@ -3,7 +3,7 @@ description: macOS implementation of the url_launcher plugin.
 # 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: 0.0.1+8
+version: 0.0.1+9
 homepage: https://github.com/flutter/plugins/tree/master/packages/url_launcher/url_launcher_macos
 
 flutter:
diff --git a/packages/url_launcher/url_launcher_windows/CHANGELOG.md b/packages/url_launcher/url_launcher_windows/CHANGELOG.md
index 5dd437efc064..3bf040f964e6 100644
--- a/packages/url_launcher/url_launcher_windows/CHANGELOG.md
+++ b/packages/url_launcher/url_launcher_windows/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.0.1+3
+
+* Update Dart SDK constraint in example.
+
 ## 0.0.1+2
 
 * Check in windows/ directory for example/
diff --git a/packages/url_launcher/url_launcher_windows/example/pubspec.yaml b/packages/url_launcher/url_launcher_windows/example/pubspec.yaml
index 8d6c22057bc2..44a5424168c9 100644
--- a/packages/url_launcher/url_launcher_windows/example/pubspec.yaml
+++ b/packages/url_launcher/url_launcher_windows/example/pubspec.yaml
@@ -17,3 +17,7 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+environment:
+  sdk: ">=2.1.0 <3.0.0"
+  flutter: ">=1.12.8 <2.0.0"
diff --git a/packages/url_launcher/url_launcher_windows/pubspec.yaml b/packages/url_launcher/url_launcher_windows/pubspec.yaml
index 34e410c50313..dd7423d017f8 100644
--- a/packages/url_launcher/url_launcher_windows/pubspec.yaml
+++ b/packages/url_launcher/url_launcher_windows/pubspec.yaml
@@ -3,7 +3,7 @@ description: Windows implementation of the url_launcher plugin.
 # 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: 0.0.1+2
+version: 0.0.1+3
 homepage: https://github.com/flutter/plugins/tree/master/packages/url_launcher/url_launcher_windows
 
 flutter:
diff --git a/packages/video_player/video_player/CHANGELOG.md b/packages/video_player/video_player/CHANGELOG.md
index e02bd76aa818..575902e00575 100644
--- a/packages/video_player/video_player/CHANGELOG.md
+++ b/packages/video_player/video_player/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.11.1+5
+
+* Update Dart SDK constraint in example.
+
 ## 0.11.1+4
 
 * Add `toString()` to `Caption`.
@@ -13,7 +17,7 @@
 ## 0.11.1+1
 
 * Fixed uncanceled timers when calling `play` on the controller multiple times before `pause`, which
-  caused value listeners to be called indefinitely (after `pause`) and more often than needed. 
+  caused value listeners to be called indefinitely (after `pause`) and more often than needed.
 
 ## 0.11.1
 
diff --git a/packages/video_player/video_player/example/pubspec.yaml b/packages/video_player/video_player/example/pubspec.yaml
index e0afa4193dc2..41d7c651ac12 100644
--- a/packages/video_player/video_player/example/pubspec.yaml
+++ b/packages/video_player/video_player/example/pubspec.yaml
@@ -23,3 +23,7 @@ flutter:
    - assets/flutter-mark-square-64.png
    - assets/Butterfly-209.mp4
    - assets/bumble_bee_captions.srt
+
+environment:
+  sdk: ">=2.8.0 <3.0.0"
+  flutter: ">=1.12.13+hotfix.5 <2.0.0"
diff --git a/packages/video_player/video_player/pubspec.yaml b/packages/video_player/video_player/pubspec.yaml
index 8234fee272e3..c12df3fe1194 100644
--- a/packages/video_player/video_player/pubspec.yaml
+++ b/packages/video_player/video_player/pubspec.yaml
@@ -4,7 +4,7 @@ description: Flutter plugin for displaying inline video with other Flutter
 # 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: 0.11.1+4
+version: 0.11.1+5
 homepage: https://github.com/flutter/plugins/tree/master/packages/video_player/video_player
 
 flutter: