diff --git a/lib/ulid/rails/version.rb b/lib/ulid/rails/version.rb
index 2f38ec4..89a4d61 100644
--- a/lib/ulid/rails/version.rb
+++ b/lib/ulid/rails/version.rb
@@ -1,5 +1,5 @@
 module ULID
   module Rails
-    VERSION = "0.3.0"
+    VERSION = "0.4.0"
   end
 end