Apple today released OS X 10.9.3, after two months of developer testing. The last 10.9.3 developer beta, build 13D61, was released just over a week ago.

The update, which is recommended for all Mavericks users, improves 4K display support on the late 2013 Mac Pro and 15-inch MacBook Pro with Retina display. According to the release notes, it also re-adds the ability to sync contacts and calendars between Macs and iOS devices using a USB connection and it improves the reliability of VPN connections using IPSec.

Today's update also includes Safari 7.0.3, and Apple has released iTunes 11.2 as well.

The OS X Mavericks 10.9.3 Update is recommended for all Mavericks users. It improves the stability, compatibility, and security of your Mac.

This update: - Improves 4K display support on Mac Pro (Late 2013) and MacBook Pro with 15-inch Retina Display (Late 2013)

- Adds the ability to sync contacts and calendars between a Mac and iOS device using a USB connection

- Improves the reliability of VPN connections using IPsec

- Includes Safari 7.0.3 For detailed information about this update, please visit: http://support.apple.com/kb/HT6228

For detailed information about the security content of this update, please visit: http://support.apple.com/kb/HT1222

First outlined after the initial 10.9.3 beta, the improved 4K support enables HiDPI Retina scaling on 4K displays for the 2013 Mac Pro and Retina MacBook Pro with DisplayPort 1.2, which improves the size and readability of text and other on-screen elements. 10.9.3 also includes 60Hz 4K output for the 2013 Retina Macbook Pros and the higher refresh rates will improve response times for smoother game playing, video editing, and more.

OS X 10.9.3 can be downloaded through the software update function in the Mac App Store or through the following links:

- OS X Mavericks Update v10.9.3 (461.7 MB)

- OS X Mavericks Update v10.9.3 (Combo) (947.2 MB)