diff --git a/lib/active_model/serializer/version.rb b/lib/active_model/serializer/version.rb
index fa2ed76d..b7ae4be8 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.pre"
+    VERSION = '0.9.0.alpha1'
   end
 end