diff --git a/tools/appliance/definitions/systemvmtemplate/apt_upgrade.sh b/tools/appliance/definitions/systemvmtemplate/apt_upgrade.sh
index 0116f9978e8..645d86debb5 100644
--- a/tools/appliance/definitions/systemvmtemplate/apt_upgrade.sh
+++ b/tools/appliance/definitions/systemvmtemplate/apt_upgrade.sh
@@ -21,7 +21,9 @@ set -x
 
 function add_backports() {
   sed -i '/backports/d' /etc/apt/sources.list
+  sed -i '/security/d' /etc/apt/sources.list
   echo 'deb http://http.debian.net/debian wheezy-backports main' >> /etc/apt/sources.list
+  echo 'deb http://security.debian.org/debian-security wheezy/updates main' >> /etc/apt/sources.list
 }
 
 function apt_upgrade() {
@@ -33,6 +35,7 @@ function apt_upgrade() {
   apt-get clean
   apt-get -q -y --force-yes update
   apt-get -q -y --force-yes upgrade
+  apt-get -q -y --force-yes dist-upgrade
 }
 
 return 2>/dev/null || apt_upgrade