Hi,
If you have a current - valid Cisco Smartnet contract (CON-SAS-CSACS-3.x) - then you are entitled to a free upgrade, otherwise you can purchase an upgrade (CSACS-3.2-WINUP-K9) - Either option should be available from your Cisco reseller (or if you are a reseller, then contact your Cisco Distributor)
Regards,
Rowan