diff --git a/os/variables.tf b/os/variables.tf
index b2e922c..31a9e05 100644
--- a/os/variables.tf
+++ b/os/variables.tf
@@ -7,9 +7,9 @@ variable "standard_os" {
   default = {
     "UbuntuServer"  = "Canonical,UbuntuServer,16.04-LTS"
     "WindowsServer" = "MicrosoftWindowsServer,WindowsServer,2016-Datacenter"
-    "RHEL"          = "RedHat,RHEL,7.3"
+    "RHEL"          = "RedHat,RHEL,7.5"
     "openSUSE-Leap" = "SUSE,openSUSE-Leap,42.2"
-    "CentOS"        = "OpenLogic,CentOS,7.3"
+    "CentOS"        = "OpenLogic,CentOS,7.6"
     "Debian"        = "credativ,Debian,8"
     "CoreOS"        = "CoreOS,CoreOS,Stable"
     "SLES"          = "SUSE,SLES,12-SP2"