diff --git a/app/releases.js b/app/releases.js
index c975fe5..2c65042 100644
--- a/app/releases.js
+++ b/app/releases.js
@@ -18,9 +18,14 @@ export function selectReleasesToDelete(releases, keepCount) {
     return Number.isNaN(time) ? 0 : time
   }
   // 先一次性計算每筆的時間戳,避免在排序比較中重複呼叫 Date.parse。
+  // 時間相同時以 id(數值,大者為新)作為次要鍵,確保排序結果具決定性。
   return releases
-    .map((release) => ({ release, time: createdTime(release) }))
-    .sort((a, b) => b.time - a.time)
+    .map((release) => ({
+      release,
+      time: createdTime(release),
+      id: Number(release?.id) || 0,
+    }))
+    .sort((a, b) => b.time - a.time || b.id - a.id)
     .map((entry) => entry.release)
     .slice(keepCount)
 }