Adobe just released an update to the Perpetual License version of Photoshop (that's the standard box or download version, not Creative Cloud subscriptions) to 13.0.5 for Macintosh and 22.214.171.124 for Windows. The update for Creative Cloud members will be released with the new CC version on June 17th.
To get the update, open Photoshop and go to the Help menu and choose Updates. You can read about the updates here. This will probably be the last update for CS6 as the new CC version will be released in a couple of weeks.