Apple has released OS X 10.9.3 Mavericks, following two months of testing. The update, which is recommended for all Mavericks users, offers improved 4K support on late 2013 Mac Pro, and 15-inch MacBook Pro with Retina Display models.
The update also adds the ability to sync calendars and contacts between iOS devices and Macs via a USB connection, and improves the reliability of VPN connections using IPSec.
The update also includes Safari 7.0.3.
For detailed information about this update, visit: http://support.apple.com/kb/HT6228
For detailed information about the security content of this update, visit: http://support.apple.com/kb/HT1222
The OS X 10.9.3 Mavericks update can be downloaded via the update tab in the Mac App Store.