Adobe has released free updates for Photoshop CS6, but only for

Mac perpetual license users, and Creative Cloud Mac + Win users.

It appears that owners of Windows perpetual licenses are SOL for the moment.

From the Photoshop.com Blog:

Photoshop 13.0.3/13.1.1 Updates Now Available

As always, Backup first, and Create a Restore Point before applying updates. Good luck.