diff --git a/debian/changelog b/debian/changelog
index 2d0f3db..0c59df3 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+lightdm (1.30.0-0deepin6) unstable; urgency=medium
+
+  * fix: adjust OOMScore for lightdm service
+
+ -- fuleyi <fuleyi@uniontech.com>  Thu, 18 Dec 2025 11:07:35 +0800
+
 lightdm (1.30.0-0deepin5) unstable; urgency=medium
 
   * Restarting the service 5 seconds after lightdm exits on-failure
diff --git a/debian/lightdm.service b/debian/lightdm.service
index 0115263..ae67707 100644
--- a/debian/lightdm.service
+++ b/debian/lightdm.service
@@ -17,6 +17,7 @@ Restart=on-failure
 RestartSec=5s
 IgnoreSIGPIPE=no
 BusName=org.freedesktop.DisplayManager
+OOMScoreAdjust=-999
 
 [Install]
 Alias=display-manager.service