diff --git a/lib/msgpack/version.rb b/lib/msgpack/version.rb
index 9fe88148..410b0237 100644
--- a/lib/msgpack/version.rb
+++ b/lib/msgpack/version.rb
@@ -1,3 +1,3 @@
 module MessagePack
-	VERSION = "0.6.2"
+  VERSION = "0.7.0dev1"
 end