Apple has just released several new beta seeds to developers today, including a build of OS X 10.9.4 (build number 13E16), a new version of Safari 6.1.5, and OS X Server 3.2 (build 13S5515).
The first beta build of OS X 10.9.4 was released at the end of last month, but so far there don’t seem to be any major new changes in the update. This is the first seed of Safari 6.1.5 that has been published, and it likely contains just a few bug fixes and improvements. This is also the first seed of OS X Server 3.2, which requires Mavericks 10.9.4 to install.
Registered Mac developers can get all of this software from the Mac Developer Center. None of these updates appear to be available to AppleSeed members yet. The Mavericks seed notes are below: