diff --git a/tools/appliance/definitions/systemvm64template/postinstall.sh b/tools/appliance/definitions/systemvm64template/postinstall.sh
index 064a2226d06..62c4d039f13 100644
--- a/tools/appliance/definitions/systemvm64template/postinstall.sh
+++ b/tools/appliance/definitions/systemvm64template/postinstall.sh
@@ -109,6 +109,10 @@ 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 5370849a6d9..e613ceb40a8 100644
--- a/tools/appliance/definitions/systemvmtemplate/postinstall.sh
+++ b/tools/appliance/definitions/systemvmtemplate/postinstall.sh
@@ -99,6 +99,10 @@ 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() {