Added version constraints to dependencies
diff --git a/pubspec.yaml b/pubspec.yaml
index 215f35f..b76be7a 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,8 +4,8 @@
 description: The official Dart project benchmark harness.
 homepage: http://www.dartlang.org
 dependencies:
-  browser: any
+  browser: ">=0.10.0+2 <0.11.0"
 dev_dependencies:
-  unittest: any
+  unittest: ">=0.10.0 <0.11.0"
   hop: ">=0.30.3 <0.31.0"
   path: ">=1.1.0 <2.0.0"