diff --git a/05.PVE制作虚拟机模板.md b/05.PVE制作虚拟机模板.md
index 547e6fe..d472374 100644
--- a/05.PVE制作虚拟机模板.md
+++ b/05.PVE制作虚拟机模板.md
@@ -112,13 +112,15 @@ $ sudo vim /etc/apt/sources.list.d/debian.sources
 
 Types: deb
 URIs: https://mirrors.ustc.edu.cn/debian
-Suites: bookworm bookworm-updates bookworm-backports
+Suites: bookworm bookworm-updates
 Components: main contrib non-free non-free-firmware
+Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
 
 Types: deb
 URIs: https://mirrors.ustc.edu.cn/debian-security
 Suites: bookworm-security
 Components: main contrib non-free non-free-firmware
+Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
 
 ```
 
diff --git a/src/debian/debian_sources.conf b/src/debian/debian_sources.conf
index b04634d..ce6f263 100644
--- a/src/debian/debian_sources.conf
+++ b/src/debian/debian_sources.conf
@@ -1,10 +1,12 @@
 Types: deb
 URIs: https://mirrors.ustc.edu.cn/debian
-Suites: bookworm bookworm-updates bookworm-backports
+Suites: bookworm bookworm-updates
 Components: main contrib non-free non-free-firmware
+Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
 
 Types: deb
 URIs: https://mirrors.ustc.edu.cn/debian-security
 Suites: bookworm-security
 Components: main contrib non-free non-free-firmware
+Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg