Apple releases OS X 10.9.4 with wake-from-sleep and Wi-Fi fixes
In addition to iOS 7.1.2, Apple today released OS X version 10.9.4 for all Macs running Mavericks. While 10.9.3 was a relatively large update that improved 4K display support on several Macs and restored local contact and calendar syncing, 10.9.4 is only a few hundred megabytes and focuses on smaller problems.
Apple's official release notes indicate that the update resolves a problem some Macs had with re-joining known Wi-Fi networks, makes wake-from-sleep more reliable, and solves a problem where the Apple logo wouldn't display correctly at boot. The update also includes Safari 7.0.5.