roll for null safety (#51)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b53a1c8..04be959 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+#### 4.0.0-nullsafety.3
+
+* Update supported SDK range.
+
 #### 4.0.0-nullsafety.2
 
 * Update supported SDK range.
diff --git a/pubspec.yaml b/pubspec.yaml
index bedd57b..42c340b 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,10 +1,10 @@
 name: process
-version: 4.0.0-nullsafety.2
+version: 4.0.0-nullsafety.3
 description: A pluggable, mockable process invocation abstraction for Dart.
 homepage: https://github.com/google/process.dart
 
 environment:
-  sdk: '>=2.10.0-0.0 <2.11.0'
+  sdk: '>=2.10.0-0.0 <2.12.0'
 
 dependencies:
   file: '^6.0.0-nullsafety.1'