Apple seeded the latest build (13F31) of OS X Mavericks 10.9.5 to developers on Friday, just a little over a week after seeding the fifth OS X 10.9.5 beta, build 13F24. Apple is asking developers to focus on testing Safari, USB, USB Smart Cards, Graphics, Thunderbolt, and Gatekeeper.
OS X Mavericks 10.9.5 (Build 13F31) is available for developers to download via the Update tab in the Mac App Store, and via download from the Mac Developer Center.
While Apple puts what will likely be the finishing touches on Mavericks, the company is also working on its next-generation Mac operating system, OS X Yosemite. The new OS is likely to debut sometime this fall.