clean up
diff --git a/packages/connectivity/connectivity/pubspec.yaml b/packages/connectivity/connectivity/pubspec.yaml
index a68ef36..4cd8085 100644
--- a/packages/connectivity/connectivity/pubspec.yaml
+++ b/packages/connectivity/connectivity/pubspec.yaml
@@ -40,5 +40,5 @@
   pedantic: ^1.10.0-nullsafety.1
 
 environment:
-  sdk: '>=2.12.0-0 <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/pubspec.yaml b/packages/connectivity/connectivity_platform_interface/pubspec.yaml
index f9b7c87..13ecba9 100644
--- a/packages/connectivity/connectivity_platform_interface/pubspec.yaml
+++ b/packages/connectivity/connectivity_platform_interface/pubspec.yaml
@@ -17,5 +17,5 @@
   pedantic: ^1.10.0-nullsafety.1
 
 environment:
-  sdk: '>=2.12.0-0 <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/pubspec.yaml b/packages/device_info/device_info/pubspec.yaml
index 03610ff..9a3ba6f 100644
--- a/packages/device_info/device_info/pubspec.yaml
+++ b/packages/device_info/device_info/pubspec.yaml
@@ -27,5 +27,5 @@
   pedantic: ^1.10.0-nullsafety.1
 
 environment:
-  sdk: '>=2.12.0-0 <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_platform_interface/analysis_options.yaml b/packages/device_info/device_info_platform_interface/analysis_options.yaml
index 32ff54f..3d64bb5 100644
--- a/packages/device_info/device_info_platform_interface/analysis_options.yaml
+++ b/packages/device_info/device_info_platform_interface/analysis_options.yaml
@@ -1,4 +1,4 @@
 include: ../../../analysis_options.yaml
 analyzer:
   enable-experiment:
-    - non-nullable
\ No newline at end of file
+    - non-nullable
diff --git a/packages/device_info/device_info_platform_interface/pubspec.yaml b/packages/device_info/device_info_platform_interface/pubspec.yaml
index 3e8ce64..02d3749 100644
--- a/packages/device_info/device_info_platform_interface/pubspec.yaml
+++ b/packages/device_info/device_info_platform_interface/pubspec.yaml
@@ -18,5 +18,5 @@
   pedantic: ^1.10.0-nullsafety.1
 
 environment:
-  sdk: '>=2.12.0-0 <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/pubspec.yaml b/packages/plugin_platform_interface/pubspec.yaml
index 66a3b6c..05fc918 100644
--- a/packages/plugin_platform_interface/pubspec.yaml
+++ b/packages/plugin_platform_interface/pubspec.yaml
@@ -17,7 +17,7 @@
 repository: https://github.com/flutter/plugins/tree/master/packages/plugin_platform_interface
 
 environment:
-  sdk: '>=2.12.0-0 <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_platform_interface/pubspec.yaml b/packages/url_launcher/url_launcher_platform_interface/pubspec.yaml
index 2b5e67d..15721b5 100644
--- a/packages/url_launcher/url_launcher_platform_interface/pubspec.yaml
+++ b/packages/url_launcher/url_launcher_platform_interface/pubspec.yaml
@@ -17,5 +17,5 @@
   pedantic: ^1.10.0-nullsafety.1
 
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: ">=2.12.0-0 <3.0.0"
   flutter: ">=1.9.1+hotfix.4 <2.0.0"
diff --git a/packages/video_player/video_player/pubspec.yaml b/packages/video_player/video_player/pubspec.yaml
index 1c40cf0..3961391 100644
--- a/packages/video_player/video_player/pubspec.yaml
+++ b/packages/video_player/video_player/pubspec.yaml
@@ -39,5 +39,5 @@
   pigeon: 0.1.7
 
 environment:
-  sdk: '>=2.12.0-0 <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_web/pubspec.yaml b/packages/video_player/video_player_web/pubspec.yaml
index 098c9f5..cab66d5 100644
--- a/packages/video_player/video_player_web/pubspec.yaml
+++ b/packages/video_player/video_player_web/pubspec.yaml
@@ -29,5 +29,5 @@
   pedantic: ^1.10.0-nullsafety.1
 
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: ">=2.12.0-0 <3.0.0"
   flutter: ">=1.12.13+hotfix.5 <2.0.0"