diff --git a/analysis_options.yaml b/analysis_options.yaml
index 8957dfe03..68eea153e 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -114,7 +114,6 @@ linter:
     # - parameter_assignments # we do this commonly
     - prefer_adjacent_string_concatenation
     - prefer_asserts_in_initializer_lists
-    - prefer_bool_in_asserts
     - prefer_collection_literals
     - prefer_conditional_assignment
     - prefer_const_constructors
diff --git a/dev/devicelab/pubspec.yaml b/dev/devicelab/pubspec.yaml
index 9dee6de4a..806398855 100644
--- a/dev/devicelab/pubspec.yaml
+++ b/dev/devicelab/pubspec.yaml
@@ -5,7 +5,7 @@ homepage: https://github.com/flutter/flutter
 
 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:
   args: 1.5.1
diff --git a/packages/flutter/pubspec.yaml b/packages/flutter/pubspec.yaml
index 81564e6a2..9f85ed7ab 100644
--- 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
index aa930cbdf..531d24b71 100644
--- 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
index 5f89d0f18..a869162b0 100644
--- 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".