diff --git a/tools/appliance/definitions/systemvmtemplate/definition.rb b/tools/appliance/definitions/systemvmtemplate/definition.rb
index 54c85aa60ef..c9f0ba43c6f 100644
--- a/tools/appliance/definitions/systemvmtemplate/definition.rb
+++ b/tools/appliance/definitions/systemvmtemplate/definition.rb
@@ -3,9 +3,9 @@ Veewee::Definition.declare({
   :memory_size=> '256',
   :disk_size => '2000', :disk_format => 'VDI', :hostiocache => 'off',
   :os_type_id => 'Debian',
-  :iso_file => "debian-7.0.0-i386-netinst.iso",
-  :iso_src => "http://cdimage.debian.org/mirror/cdimage/archive/7.0.0/i386/iso-cd/debian-7.0.0-i386-netinst.iso",
-  :iso_md5 => "a6b93666a5393334accb7ac4ee28d949",
+  :iso_file => "debian-7.5.0-i386-netinst.iso",
+  :iso_src => "http://cdimage.debian.org/mirror/cdimage/archive/7.5.0/i386/iso-cd/debian-7.5.0-i386-netinst.iso",
+  :iso_md5 => "0e6eaacb5a5828473afe90f6df9c8f16",
   :iso_download_timeout => "1000",
   :boot_wait => "10", :boot_cmd_sequence => [
      '<Esc>',
diff --git a/tools/appliance/definitions/systemvmtemplate/postinstall.sh b/tools/appliance/definitions/systemvmtemplate/postinstall.sh
index dc3d130d7f9..51006c9d8ca 100644
--- a/tools/appliance/definitions/systemvmtemplate/postinstall.sh
+++ b/tools/appliance/definitions/systemvmtemplate/postinstall.sh
@@ -31,6 +31,8 @@ install_packages() {
   DEBIAN_FRONTEND=noninteractive
   DEBIAN_PRIORITY=critical
 
+  DEBIAN_FRONTEND=noninteractive apt-get --no-install-recommends -qq -y --force-yes upgrade
+
   # Basic packages
   apt-get --no-install-recommends -q -y --force-yes install rsyslog logrotate cron chkconfig insserv net-tools ifupdown vim-tiny netbase iptables
   apt-get --no-install-recommends -q -y --force-yes install openssh-server openssl e2fsprogs dhcp3-client tcpdump socat wget
diff --git a/tools/appliance/definitions/systemvmtemplate64/definition.rb b/tools/appliance/definitions/systemvmtemplate64/definition.rb
index 713ee750dfe..cd7e1463e58 100644
--- a/tools/appliance/definitions/systemvmtemplate64/definition.rb
+++ b/tools/appliance/definitions/systemvmtemplate64/definition.rb
@@ -3,9 +3,9 @@ Veewee::Definition.declare({
   :memory_size=> '256',
   :disk_size => '2000', :disk_format => 'VDI', :hostiocache => 'off',
   :os_type_id => 'Debian_64',
-  :iso_file => "debian-7.0.0-amd64-netinst.iso",
-  :iso_src => "http://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-7.4.0-amd64-netinst.iso",
-  :iso_md5 => "e7e9433973f082a297793c3c5010b2c5",
+  :iso_file => "debian-7.5.0-amd64-netinst.iso",
+  :iso_src => "http://cdimage.debian.org/mirror/cdimage/archive/7.5.0/amd64/iso-cd/debian-7.5.0-amd64-netinst.iso",
+  :iso_md5 => "8fdb6715228ea90faba58cb84644d296",
   :iso_download_timeout => "1000",
   :boot_wait => "10", :boot_cmd_sequence => [
      '<Esc>',
diff --git a/tools/appliance/definitions/systemvmtemplate64/postinstall.sh b/tools/appliance/definitions/systemvmtemplate64/postinstall.sh
index a330cea89b6..515348c6224 100644
--- a/tools/appliance/definitions/systemvmtemplate64/postinstall.sh
+++ b/tools/appliance/definitions/systemvmtemplate64/postinstall.sh
@@ -32,6 +32,8 @@ install_packages() {
   DEBIAN_FRONTEND=noninteractive
   DEBIAN_PRIORITY=critical
 
+  DEBIAN_FRONTEND=noninteractive apt-get --no-install-recommends -qq -y --force-yes upgrade
+
   # Basic packages
   apt-get --no-install-recommends -q -y --force-yes install rsyslog logrotate cron chkconfig insserv net-tools ifupdown vim-tiny netbase iptables
   apt-get --no-install-recommends -q -y --force-yes install openssh-server openssl e2fsprogs dhcp3-client tcpdump socat wget