diff --git a/packages/center/handler.ts b/packages/center/handler.ts
index d2737e55..8ad14e9f 100644
--- a/packages/center/handler.ts
+++ b/packages/center/handler.ts
@@ -1,5 +1,6 @@
 import crypto from 'crypto';
 import yaml from 'js-yaml';
+import * as bus from 'hydrooj/src/service/bus';
 import db from 'hydrooj/src/service/db';
 import {
     Handler, post, Route, Types,
@@ -28,6 +29,7 @@ class DataReportHandler extends Handler {
     @post('payload', Types.String)
     async post(domainId: string, installId: string, _payload: string) {
         const payload: any = yaml.load(decrypt(_payload));
+        const old = await coll.findOne({ _id: installId });
         await coll.updateOne({ _id: installId }, {
             $set: {
                 version: payload.version,
@@ -45,9 +47,11 @@ class DataReportHandler extends Handler {
                 problemCount: payload.problemCount,
                 discussionCount: payload.discussionCount,
                 recordCount: payload.recordCount,
+                sandbox: payload.sandbox,
             },
         }, { upsert: true });
-        this.response.body = 'success';
+        bus.emit('center/report', this, installId, old, payload);
+        this.response.body = { code: 0 };
     }
 }
 
diff --git a/packages/center/package.json b/packages/center/package.json
index 88be34cc..ec676a34 100644
--- a/packages/center/package.json
+++ b/packages/center/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@hydrooj/center",
-    "version": "0.1.0",
+    "version": "0.1.1",
     "main": "package.json",
     "repository": "https://github.com/hydro-dev/Hydro.git",
     "author": "undefined <i@undefined.moe>",
diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 4dfc920c..28bf1ce5 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "3.15.8",
+    "version": "3.15.9",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",
diff --git a/packages/hydrooj/src/model/setting.ts b/packages/hydrooj/src/model/setting.ts
index d3438250..0d3db2f0 100644
--- a/packages/hydrooj/src/model/setting.ts
+++ b/packages/hydrooj/src/model/setting.ts
@@ -198,7 +198,7 @@ SystemSetting(
     Setting('setting_smtp', 'smtp.from', null, 'text', 'smtp.from', 'Mail From'),
     Setting('setting_smtp', 'smtp.secure', false, 'boolean', 'smtp.secure', 'SSL'),
     Setting('setting_smtp', 'smtp.verify', true, 'boolean', 'smtp.verify', 'Verify register email'),
-    Setting('setting_server', 'server.center', 'https://hydro.undefined.moe:8443/center', 'text', 'server.center', '', FLAG_HIDDEN),
+    Setting('setting_server', 'server.center', 'https://hydro.ac/center', 'text', 'server.center', '', FLAG_HIDDEN),
     Setting('setting_server', 'server.name', 'Hydro', 'text', 'server.name', 'Server Name'),
     Setting('setting_server', 'server.displayName', 'Hydro', 'text', 'server.name', 'Server Name (Global Display)', FLAG_PRO),
     Setting('setting_server', 'server.url', '/', 'text', 'server.url', 'Server BaseURL'),
diff --git a/packages/hydrooj/src/service/monitor.ts b/packages/hydrooj/src/service/monitor.ts
index 15ed8b71..5670e5ee 100644
--- a/packages/hydrooj/src/service/monitor.ts
+++ b/packages/hydrooj/src/service/monitor.ts
@@ -33,6 +33,13 @@ export async function feedback(): Promise<[string, StatusUpdate]> {
         document.coll.find({ docType: document.TYPE_DISCUSSION }).count(),
         record.coll.find().count(),
     ]);
+    let sandbox = '';
+    try {
+        let host = system.get('hydrojudge.sandbox_host') || 'http://localhost:5050/';
+        if (!host.endsWith('/')) host += '/';
+        const res = await superagent.get(`${host}version`);
+        sandbox = res.body;
+    } catch (e) { }
     const payload = crypt(dump({
         mid: mid.toString(),
         version,
@@ -47,6 +54,7 @@ export async function feedback(): Promise<[string, StatusUpdate]> {
         memory: inf.memory,
         osinfo: inf.osinfo,
         cpu: inf.cpu,
+        sandbox,
     }, {
         replacer: (key, value) => {
             if (typeof value === 'function') return '';
diff --git a/packages/hydrooj/src/upgrade.ts b/packages/hydrooj/src/upgrade.ts
index 8c1dfbad..f94bf6e7 100644
--- a/packages/hydrooj/src/upgrade.ts
+++ b/packages/hydrooj/src/upgrade.ts
@@ -791,6 +791,10 @@ const scripts: UpgradeScript[] = [
         );
         return true;
     },
+    async function _64_65() {
+        await system.set('server.center', 'https://hydro.ac/center');
+        return true;
+    },
 ];
 
 export default scripts;