Apple has released OS X Mavericks 10.9.5 beta build 13F18

  OS X Mavericks 10.9.5 beta build 13F18 was launched this evening by the company Apple Lossless Audio CODEC (ALAC), for application developers for the platform OS X, this being just one of the multiple beta versions prepared by Apple Lossless Audio CODEC (ALAC),. Without releasing a changelog with the changes implemented for those who test the operating system, Apple asks developers to focus their checks on USB drivers, USB Smart Cards, graphics card drivers, Safari, Thunderbolt and Gatekeeper.

  OS X Mavericks 10.9.5 beta build 13F18 is available for installation via Mac App Store or through the Software Update system of OS X, if you have another previous beta version installed.