diff --git a/packages/center/index.ts b/packages/center/index.ts
index 26bf9ec28..d2f4e8df4 100644
--- a/packages/center/index.ts
+++ b/packages/center/index.ts
@@ -67,7 +67,7 @@ class DataReportHandler extends Handler {
             await coll.updateOne(
                 { _id: installId },
                 {
-                    $push: {
+                    $addToSet: {
                         ips: this.request.ip,
                     },
                     $set: { downgrade: setPayload },
@@ -75,7 +75,7 @@ class DataReportHandler extends Handler {
             );
         } else {
             await coll.updateOne({ _id: installId }, {
-                $push: {
+                $addToSet: {
                     ips: this.request.ip,
                 },
                 $set: setPayload,
diff --git a/packages/center/package.json b/packages/center/package.json
index d00d4f79e..379a37f57 100644
--- a/packages/center/package.json
+++ b/packages/center/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@hydrooj/center",
-    "version": "0.2.5",
+    "version": "0.2.6",
     "main": "index.ts",
     "repository": "https://github.com/hydro-dev/Hydro.git",
     "author": "undefined <i@undefined.moe>",