Apple seeded Mavericks 10.9.5 build 13F24 to developers, just over a week after seeding the fourth OS X 10.9.5 beta, build 13F18, 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, Thunderbolt, and Gatekeeper.
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 13F18 to developers, just under a week after seeding the third OS X 10.9.5 beta, build 13F14, 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, Thunderbolt, and Gatekeeper.

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.

The new OS X 10.9.5 Mavericks seed, build number 13F7, comes one month to the day after Apple released OS X 10.9.4 to the public in June, which brought fixes for Wi-Fi connectivity and wake-from-sleep bugs.

With the new seed, Apple is asking developers to focus on Safari, USB, USB Smart Cards and graphics. Previous updates, like beta versions of the aforementioned OS X 10.9.4, brought similar enhancements, but USB and USB Smart Cards are new areas of concern. Apple did, however, put priority on USB connectivity as it applies to iTunes in OS X 10.9.4.

Alongside the Mavericks seed, Apple also released Safari 7.0.6 for Mavericks, as well as Safari 6.1.6 for OS X 10.8 Mountain Lion and OS X 10.7 Lion. The company is asking developers to concentrate on general website compatibility and extensions.