diff --git a/test/active_record/support/models/user.rb b/test/active_record/support/models/user.rb
index 1249165..492c606 100644
--- a/test/active_record/support/models/user.rb
+++ b/test/active_record/support/models/user.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 class User < ActiveRecord::Base
-  serialize :serialized_attribute, Hash
+  serialize :serialized_attribute, type: Hash
   mount_uploader :profile_pic, ProfilePictureUploader
   mount_uploader :pet_pic, PetPictureUploader
   has_many :posts