diff --git a/tools/appliance/definitions/systemvm64template/postinstall.sh b/tools/appliance/definitions/systemvm64template/postinstall.sh
index b634f11d649..fc1333d1c8c 100644
--- a/tools/appliance/definitions/systemvm64template/postinstall.sh
+++ b/tools/appliance/definitions/systemvm64template/postinstall.sh
@@ -107,6 +107,10 @@ install_packages() {
   apt-get --no-install-recommends -q -y --force-yes install links:i386 libuuid1:i386
 
   apt-get --no-install-recommends -q -y --force-yes install radvd
+
+  # do a final update and upgrade
+  apt-get update
+  apt-get -y --force-yes
 }
 
 setup_accounts() {
diff --git a/tools/appliance/definitions/systemvmtemplate/postinstall.sh b/tools/appliance/definitions/systemvmtemplate/postinstall.sh
index a1ae79262f4..c08a9b1b02a 100644
--- a/tools/appliance/definitions/systemvmtemplate/postinstall.sh
+++ b/tools/appliance/definitions/systemvmtemplate/postinstall.sh
@@ -97,6 +97,10 @@ install_packages() {
   apt-get --no-install-recommends -q -y --force-yes install haproxy
 
   apt-get --no-install-recommends -q -y --force-yes install radvd
+
+  # do a final update and upgrade
+  apt-get update
+  apt-get -y --force-yes
 }
 
 setup_accounts() {