diff --git a/pubspec.yaml b/pubspec.yaml
index a0b0dc4..4ae1802 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,9 +1,6 @@
 name: source_maps
-version: 0.9.0
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
 description: Library to programmatically manipulate source map files.
 dev_dependencies:
-  unittest: ">=0.9.0 <0.10.0"
-environment:
-  sdk: ">=1.0.0 <2.0.0"
+  unittest: any