Need to cover Server 2012 and Windows 8

Hi all,

I am running Sophos EC version 5.1.0.1839.  I have recently deployed a few Windows 8 machines on the network, as well as some Server 2012 boxes.  When trying to install, I get the following during the Protect Computers Wizard:

"The applied software subscription does not contain software this computer can use"

Perhaps this is more appropriately directed to Sophos support, but since I am 1.5 years into a 3-year contract, is there a new version of the EC that will support these OSs?  Where can I get it from?

Thanks!