Fix dependencies.
diff --git a/lib/async_helpers.dart b/lib/async_helpers.dart
index 121a824..1528c4b 100644
--- a/lib/async_helpers.dart
+++ b/lib/async_helpers.dart
@@ -16,7 +16,7 @@
 
 import 'dart:async' show Completer, Future;
 
-import 'package:test/test.dart' show expect, isNotNull;
+import 'package:matcher/matcher.dart' show expect, isNotNull;
 
 const defaultInterval = const Duration(milliseconds: 500);
 const defaultTimeout = const Duration(seconds: 5);
diff --git a/pubspec.yaml b/pubspec.yaml
index 50da3fc..31a3a71 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -9,6 +9,8 @@
   sdk: '>=1.9.0 <2.0.0'
 dependencies:
   crypto: '^0.9.0'
-  test: '^0.12.0-rc.1'
+  matcher: '^0.12.0-alpha.0'
 dev_dependencies:
   path: '^1.3.5'
+  test: '^0.12.0-rc.1'
+