diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index cb53d3782..6c89da335 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -5,8 +5,8 @@ environment:
   sdk: ">=2.0.0-dev.32.0 <2.0.0"
 
 dependencies:
-  angular: ^5.0.0-alpha+10
+  angular: ^5.0.0-alpha+11
 
 dev_dependencies:
   build_runner: ^0.8.5
-  build_web_compilers: ^0.3.6
+  build_web_compilers: ^0.4.0
diff --git a/webdev/CHANGELOG.md b/webdev/CHANGELOG.md
index 46c68d2cc..c0819b9b6 100644
--- a/webdev/CHANGELOG.md
+++ b/webdev/CHANGELOG.md
@@ -1,7 +1,7 @@
-- Always pass the argument `--fail-on-severe` to the `build` command.
-
 ## 0.2.1
 
+- Support `package:build_web_compilers` `v0.4.0`.
+- Always pass the argument `--fail-on-severe` to the `build` command.
 - Exit with an error if unsupported arguments are passed to `build` command.
 
 ## 0.2.0
diff --git a/webdev/lib/src/pubspec.dart b/webdev/lib/src/pubspec.dart
index 03bedbb41..b966eb6a7 100644
--- a/webdev/lib/src/pubspec.dart
+++ b/webdev/lib/src/pubspec.dart
@@ -104,7 +104,8 @@ Future checkPubspecLock({@required bool requireBuildWebCompilers}) async {
   checkPackage('build_runner', new VersionConstraint.parse('^0.8.2'));
 
   if (requireBuildWebCompilers) {
-    checkPackage('build_web_compilers', new VersionConstraint.parse('^0.3.6'));
+    checkPackage(
+        'build_web_compilers', new VersionConstraint.parse('>=0.3.6 <0.5.0'));
   }
 
   if (issues.isNotEmpty) {
diff --git a/webdev/pubspec.yaml b/webdev/pubspec.yaml
index 526c09bf2..b68a613ad 100644
--- a/webdev/pubspec.yaml
+++ b/webdev/pubspec.yaml
@@ -1,5 +1,5 @@
 name: webdev
-version: 0.2.1-dev
+version: 0.2.1
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/webdev
 description: >-
diff --git a/webdev/test/integration_test.dart b/webdev/test/integration_test.dart
index 70f195671..728f779ef 100644
--- a/webdev/test/integration_test.dart
+++ b/webdev/test/integration_test.dart
@@ -30,7 +30,7 @@ void main() {
 
   var invalidRanges = <String, List<String>>{
     'build_runner': ['0.7.13+1', '0.9.0'],
-    'build_web_compilers': ['0.3.5', '0.4.0']
+    'build_web_compilers': ['0.3.5', '0.5.0']
   };
 
   for (var command in ['build', 'serve']) {
@@ -119,7 +119,7 @@ name: sample
               } else {
                 assert(entry.key == 'build_web_compilers');
                 webCompilersVersion = version;
-                supportedRange = '^0.3.6';
+                supportedRange = '>=0.3.6 <0.5.0';
               }
 
               await d.file('pubspec.yaml', '''
@@ -242,7 +242,7 @@ dependencies:
 }
 
 const _supportedBuildRunnerVersion = '0.8.2';
-const _supportedWebCompilersVersion = '0.3.6';
+const _supportedWebCompilersVersion = '0.4.0';
 
 String _pubspecLock(
     {String runnerVersion: _supportedBuildRunnerVersion,