 --- a/packages/flutter/pubspec.yaml
 +++ b/packages/flutter/pubspec.yaml
 @@ -5,7 +5,7 @@ homepage: http://flutter.io
- 
+
  environment:
    # The pub client defaults to an <2.0.0 sdk constraint which we need to explicitly overwrite.
 -  sdk: ">=2.0.0-dev.68.0 <3.0.0"
 +  sdk: ">=2.1.0-dev.5.0 <3.0.0"
- 
+
  dependencies:
    # To update these, use "flutter update-packages --force-upgrade".
 diff --git a/packages/flutter_test/pubspec.yaml b/packages/flutter_test/pubspec.yaml

--- a/packages/flutter_test/pubspec.yaml
+++ b/packages/flutter_test/pubspec.yaml
@@ -2,7 +2,7 @@ name: flutter_test
 
 environment:
   # The pub client defaults to an <2.0.0 sdk constraint which we need to explicitly overwrite.
-  sdk: ">=2.0.0-dev.68.0 <3.0.0"
+  sdk: ">=2.1.0-dev.5.0 <3.0.0"
 
 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
diff --git a/packages/flutter_tools/pubspec.yaml b/packages/flutter_tools/pubspec.yaml

--- a/packages/flutter_tools/pubspec.yaml
+++ b/packages/flutter_tools/pubspec.yaml
@@ -5,7 +5,7 @@ author: Flutter Authors <flutter-dev@googlegroups.com>

 environment:
   # The pub client defaults to an <2.0.0 sdk constraint which we need to explicitly overwrite.
-  sdk: ">=2.0.0-dev.68.0 <3.0.0"
+  sdk: ">=2.1.0-dev.5.0 <3.0.0"

 dependencies:
   # To update these, use "flutter update-packages --force-upgrade".
