diff --git a/deploy/vps-manager-update.service b/deploy/vps-manager-update.service
index e1ec9a8..bf83249 100644
--- a/deploy/vps-manager-update.service
+++ b/deploy/vps-manager-update.service
@@ -8,4 +8,5 @@ Wants=network-online.target
 
 [Service]
 Type=oneshot
-ExecStart=/opt/vps-manager/deploy/update.sh
+# 用 bash 显式调用，不依赖脚本可执行位（避免编辑后 mode 丢失导致更新链路自毁）
+ExecStart=/bin/bash /opt/vps-manager/deploy/update.sh