Apple today seeded Mavericks 10.9.5 build 13F14 to developers, just over a week after seeding the second OS X 10.9.5 beta, build 13F12, and more than a month after releasing OS X 10.9.4 to the public.
The beta is available through the Software Update mechanism in the Mac App Store and through the Mac Developer Center.
It is unclear what improvements the 10.9.5 update will bring to Mavericks, but it is likely to include bug fixes and stability enhancements. Apple is asking developers to focus on USB, USB Smart Cards, Graphics, Safari, and Thunderbolt.
Along with working on improvements to Mavericks, Apple is also beta testing OS X Yosemite, which is due to be released in the fall. The last Mavericks update, 10.9.4, added several Wi-Fi fixes and improved wake from sleep reliability.

Apple today seeded Mavericks 10.9.5 build 13F12 to developers, just over a week after seeding the first OS X 10.9.5 beta, build 13F7, and more than a month after releasing OS X 10.9.4 to the public.

The beta is available through the Software Update mechanism in the Mac App Store and through the Mac Developer Center.

It is unclear what improvements the 10.9.5 update will bring to Mavericks, but it is likely to include bug fixes and stability enhancements. Apple is asking developers to focus on USB, USB Smart Cards, Graphics, Safari, and Thunderbolt.

Along with working on improvements to Mavericks, Apple is also beta testing OS X Yosemite, which is due to be released in the fall. The last Mavericks update, 10.9.4, added several Wi-Fi fixes and improved wake from sleep reliability.

Apple today released OS X 10.9.4 after just a month of testing and a month and a half after the release of OS X 10.9.3. The last 10.9.4 developer beta, build 13E25, was released last week.

The update, which is recommended for all Mavericks users, improves reliability of wake from sleep and fixes an issue that prevented some Macs from automatically connecting to known Wi-Fi networks. Today’s update also includes Safari 7.0.5.

The latest OS X 10.9.4 Mavericks build 13E19 marks the return to Apple’s usual one-week build release interval, coming eight days after the second beta was issued earlier in June. The initial seed was issued at the end of May following the public release of OS X 10.9.3

As with the previous OS X 10.9.3 betas, Apple is asking developers to focus on Graphics Drivers and Safari. The new OS X 10.9.4 releases tack on extra areas of interest including Bluetooth, Audio Drivers, Finder and the App Store.

Apple today seeded the first build of OS X 10.9.4 to developers, approximately two weeks after releasing OS X 10.9.3 to the public. The new beta is available thorugh the Software Update mechanism in the Mac App Store should be listed soon in the Mac Dev Center.