diff --git a/tools/appliance/systemvmtemplate/scripts/apt_upgrade.sh b/tools/appliance/systemvmtemplate/scripts/apt_upgrade.sh
index 7387159696fd..402bf21af2cc 100644
--- a/tools/appliance/systemvmtemplate/scripts/apt_upgrade.sh
+++ b/tools/appliance/systemvmtemplate/scripts/apt_upgrade.sh
@@ -35,6 +35,7 @@ function add_backports() {
   sed -i '/deb-src/d' /etc/apt/sources.list
   sed -i '/backports/d' /etc/apt/sources.list
   echo 'deb http://http.debian.net/debian stretch-backports main' >> /etc/apt/sources.list
+  echo 'deb http://security.debian.org/debian-security stretch/updates main' >> /etc/apt/sources.list
 }
 
 function apt_upgrade() {