diff --git a/fixtures/_testPackageSound/pubspec.yaml b/fixtures/_testPackageSound/pubspec.yaml
index 1d16ae5..e7c5b40 100644
--- a/fixtures/_testPackageSound/pubspec.yaml
+++ b/fixtures/_testPackageSound/pubspec.yaml
@@ -12,5 +12,5 @@
     path: ../_testSound
 
 dev_dependencies:
-  build_runner: ^2.0.0
-  build_web_compilers: ^3.0.0
+  build_runner: ^2.1.11
+  build_web_compilers: ^3.2.3
diff --git a/fixtures/_testSound/pubspec.yaml b/fixtures/_testSound/pubspec.yaml
index 83f4cb6..8a34709 100644
--- a/fixtures/_testSound/pubspec.yaml
+++ b/fixtures/_testSound/pubspec.yaml
@@ -8,9 +8,9 @@
   sdk: '>=2.13.0 <3.0.0'
 
 dependencies:
-  intl: ^0.17.0-nullsafety.2
-  path: ^1.6.1
+  intl: ^0.17.0
+  path: ^1.8.2
 
 dev_dependencies:
-  build_runner: ^2.0.0
-  build_web_compilers: ^3.0.0
+  build_runner: ^2.1.11
+  build_web_compilers: ^3.2.3
diff --git a/fixtures/_webdevSmoke/pubspec.yaml b/fixtures/_webdevSmoke/pubspec.yaml
index ef8e6e8..0240300 100644
--- a/fixtures/_webdevSmoke/pubspec.yaml
+++ b/fixtures/_webdevSmoke/pubspec.yaml
@@ -10,5 +10,5 @@
   sdk: '>=2.17.0 <3.0.0'
 
 dev_dependencies:
-  build_runner: '>=1.6.2 <3.0.0'
-  build_web_compilers: '>=2.12.0 <4.0.0'
+  build_runner: ^2.1.11
+  build_web_compilers: ^3.2.3
diff --git a/fixtures/_webdevSmoke/web/main.dart b/fixtures/_webdevSmoke/web/main.dart
index 8bf1772..832c55a 100644
--- a/fixtures/_webdevSmoke/web/main.dart
+++ b/fixtures/_webdevSmoke/web/main.dart
@@ -2,7 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// @dart = 2.9
+
 
 import 'dart:async';
 import 'dart:convert';
@@ -16,7 +16,7 @@
     print('Hello World');
     return ServiceExtensionResponse.result(json.encode({'success': true}));
   });
-  document.body.append(SpanElement()..text = 'Hello World!!');
+  document.body!.append(SpanElement()..text = 'Hello World!!');
 
   var count = 0;
   Timer.periodic(const Duration(seconds: 1), (_) {
diff --git a/fixtures/_webdevSmoke/web/scopes_main.dart b/fixtures/_webdevSmoke/web/scopes_main.dart
index 1733d9f..947860b 100644
--- a/fixtures/_webdevSmoke/web/scopes_main.dart
+++ b/fixtures/_webdevSmoke/web/scopes_main.dart
@@ -2,7 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// @dart = 2.9
+
 
 /// An example with more complicated scope
 import 'dart:async';
@@ -11,7 +11,7 @@
 final libraryPublicFinal = MyTestClass();
 
 final _libraryPrivateFinal = 1;
-Object libraryNull;
+Object? libraryNull;
 var libraryPublic = <String>['library', 'public', 'variable'];
 var notAList = NotReallyAList();
 
@@ -30,7 +30,7 @@
   var local = 'local in main';
   var intLocalInMain = 42;
   var testClass = MyTestClass();
-  Object localThatsNull;
+  Object? localThatsNull;
   identityMap['a'] = 1;
   identityMap['b'] = 2;
   map['a'] = [1, 2, 3];
@@ -79,7 +79,7 @@
 class MyTestClass<T> {
   final String message;
 
-  String notFinal;
+  String? notFinal;
 
   MyTestClass({this.message = 'world'}) {
     myselfField = this;
@@ -102,7 +102,7 @@
   //ignore: avoid_returning_this
   MyTestClass get myselfGetter => this;
 
-  MyTestClass myselfField;
+  MyTestClass? myselfField;
 
   var count = 0;
 
@@ -127,10 +127,10 @@
 
   Function closure = someFunction;
 
-  String Function() tornOff;
+  String Function()? tornOff;
 }
 
-Function someFunction() => null;
+Function? someFunction() => null;
 
 // ignore: unused_element
 int _libraryPrivateFunction(int a, int b) => a + b;