diff --git a/lib/active_model/serializers/version.rb b/lib/active_model/serializers/version.rb
index 8e787b80a..e493e9645 100644
--- a/lib/active_model/serializers/version.rb
+++ b/lib/active_model/serializers/version.rb
@@ -1,5 +1,5 @@
 module ActiveModel
   class Serializer
-    VERSION = "0.5.0"
+    VERSION = "0.5.1"
   end
 end