diff --git a/pubspec.yaml b/pubspec.yaml
index 48d4989..4b17267 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,9 +1,6 @@
 name: yaml
-version: 0.9.0
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
 description: A parser for YAML.
 dev_dependencies:
-  unittest: ">=0.9.0 <0.10.0"
-environment:
-  sdk: ">=1.0.0 <2.0.0"
+  unittest: any