change version to dev
diff --git a/pubspec.yaml b/pubspec.yaml
index 9e84f3b..724e4d7 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: json_rpc_2
-version: 2.0.5
+version: 2.0.5-dev
 author: Dart Team <misc@dartlang.org>
 description: An implementation of the JSON-RPC 2.0 spec.
 homepage: http://github.com/dart-lang/json_rpc_2