diff --git a/core/db/migrate/20230203071725_delete_obsolete_fields_from_repo.rb b/core/db/migrate/20230203071725_delete_obsolete_fields_from_repo.rb
index c889dc7f..7f6368d6 100644
--- a/core/db/migrate/20230203071725_delete_obsolete_fields_from_repo.rb
+++ b/core/db/migrate/20230203071725_delete_obsolete_fields_from_repo.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DeleteObsoleteFieldsFromRepo < ActiveRecord::Migration[6.1]
   def change
     remove_columns :uffizzi_core_repos, :deploy_preview_when_pull_request_is_opened, :delete_preview_when_pull_request_is_closed, type: :boolean
diff --git a/db/migrate/20230203134111_delete_obsolete_fields_from_repo.uffizzi_core.rb b/db/migrate/20230203134111_delete_obsolete_fields_from_repo.uffizzi_core.rb
index e345141b..aed09f74 100644
--- a/db/migrate/20230203134111_delete_obsolete_fields_from_repo.uffizzi_core.rb
+++ b/db/migrate/20230203134111_delete_obsolete_fields_from_repo.uffizzi_core.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This migration comes from uffizzi_core (originally 20230203071725)
 class DeleteObsoleteFieldsFromRepo < ActiveRecord::Migration[6.1]
   def change