diff --git a/pubspec.yaml b/pubspec.yaml
index 515206d..2a3b665 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,8 +1,11 @@
 name: http
+version: 0.9.0
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
 description: A composable, Future-based API for making HTTP requests.
 dependencies:
-  path: any
+  path: ">=0.9.0 <0.10.0"
 dev_dependencies:
-  unittest: any
+  unittest: ">=0.9.0 <0.10.0"
+environment:
+  sdk: ">=1.0.0 <2.0.0"