diff --git a/pubspec.yaml b/pubspec.yaml
index a366122..aa905cf 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,4 +1,5 @@
 name: path
+version: 0.9.0
 author: Dart Team <misc@dartlang.org>
 description: >
  A string-based path manipulation library. All of the path operations you know
@@ -7,4 +8,6 @@
 homepage: http://www.dartlang.org
 documentation: http://api.dartlang.org/docs/pkg/path
 dev_dependencies:
-  unittest: any
+  unittest: ">=0.9.0 <0.10.0"
+environment:
+  sdk: ">=0.8.10+6 <2.0.0"