diff --git a/lib/active_model/serializer/version.rb b/lib/active_model/serializer/version.rb
index 6b5b0fba..1fda65f5 100644
--- a/lib/active_model/serializer/version.rb
+++ b/lib/active_model/serializer/version.rb
@@ -1,5 +1,5 @@
 module ActiveModel
   class Serializer
-    VERSION = "0.9.0"
+    VERSION = "0.10.0.pre"
   end
 end