diff --git a/db/app_uoj233.sql b/db/app_uoj233.sql
index 48892b5..03e94c4 100644
--- a/db/app_uoj233.sql
+++ b/db/app_uoj233.sql
@@ -992,7 +992,8 @@ INSERT INTO `upgrades` (`name`, `status`, `updated_at`) VALUES
   ('16_list_v3', 'up', now()),
   ('18_user_permissions', 'up', now()),
   ('20_problem_difficulty', 'up', now()),
-  ('21_problem_difficulty', 'up', now());
+  ('21_problem_difficulty', 'up', now()),
+  ('28_remote_judge', 'up', now());
 /*!40000 ALTER TABLE `upgrades` ENABLE KEYS */;
 UNLOCK TABLES;
 
diff --git a/web/app/upgrade/28_remote_judge/README.md b/web/app/upgrade/28_remote_judge/README.md
new file mode 100644
index 0000000..2a005c3
--- /dev/null
+++ b/web/app/upgrade/28_remote_judge/README.md
@@ -0,0 +1 @@
+https://github.com/renbaoshuo/S2OJ/pull/28
diff --git a/web/app/upgrade/28_remote_judge/up.sql b/web/app/upgrade/28_remote_judge/up.sql
new file mode 100644
index 0000000..d9ee623
--- /dev/null
+++ b/web/app/upgrade/28_remote_judge/up.sql
@@ -0,0 +1,6 @@
+ALTER TABLE `problems` ADD `type` varchar(20) NOT NULL DEFAULT 'local' AFTER `difficulty`;
+ALTER TABLE `problems` ADD KEY `type` (`type`);
+
+ALTER TABLE `problems_contents` ADD `remote_content` longtext COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '' AFTER `id`;
+
+insert into judger_info (judger_name, password, ip, display_name, description) values ('remote_judger', '_judger_password_', 'uoj-remote-judger', '远端评测机', '用于桥接远端 OJ 评测机的虚拟评测机。');