diff --git a/db/migrate/20230309080338_change_user_mixin_field_collate.rb b/db/migrate/20230309080338_change_user_mixin_field_collate.rb
deleted file mode 100644
index 1899d43fe..000000000
--- a/db/migrate/20230309080338_change_user_mixin_field_collate.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-class ChangeUserMixinFieldCollate < ActiveRecord::Migration[5.2]
-  def change
-    execute("ALTER TABLE `users` MODIFY `login` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;")
-    execute("ALTER TABLE `users` MODIFY `mail` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;")
-  end
-end