Apple Releases OS X 10.9.3 With Enhanced Support for 4K Displays, Syncing Improvements
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)
Popular Stories
Apple's iPhone development roadmap runs several years into the future and the company is continually working with suppliers on several successive iPhone models simultaneously, which is why we often get rumored features months ahead of launch. The iPhone 17 series is no different, and we already have a good idea of what to expect from Apple's 2025 smartphone lineup.
If you skipped the iPhone...
iPadOS 26 allows iPads to function much more like Macs, with a new app windowing system, a swipe-down menu bar at the top of the screen, and more. However, Apple has stopped short of allowing iPads to run macOS, and it has now explained why.
In an interview this week with Swiss tech journalist Rafael Zeier, Apple's software engineering chief Craig Federighi said that iPadOS 26's new Mac-like ...
With iOS 26, Apple has introduced some major changes to the iPhone experience, headlined by the new Liquid Glass redesign that's available across all compatible devices. However, several of the update's features are exclusive to iPhone 15 Pro and iPhone 16 models, since they rely on Apple Intelligence.
The following features are powered by on-device large language models and machine...
Apple at WWDC previewed a bunch of new features coming in its updated operating systems, but certain changes will have been met with dismay by third-party developers who already offer apps with equivalent or similar features. In other words, their product has been "sherlocked" by Apple.
When Apple creates an app or a feature that has functionality found in a third-party app, it is referred...
iOS 26 features a whole new design material that Apple calls Liquid Glass, with a focus on transparency that lets the content on your display shine through the controls. If you're not a fan of the look, or are having trouble with readability, there is a step that you can take to make things more opaque without entirely losing out on the new look.
Apple has multiple Accessibility options that ...
At today's WWDC 2025 keynote event, Apple unveiled a new design that will inform the next decade of iOS, iPadOS, and macOS development, so needless to say, it was a busy day. Apple also unveiled a ton of new features for the iPhone, an overhauled Spotlight interface for the Mac, and a ton of updates that make the iPad more like a Mac than ever before.
Subscribe to the MacRumors YouTube channel ...
Apple this week announced that iPhone users will soon be able to watch videos right on the CarPlay screen in supported vehicles.
iPhone users will be able to wirelessly stream videos to the CarPlay screen using AirPlay, according to Apple. For safety reasons, video playback will only be available when the vehicle is parked, to prevent distracted driving. The connected iPhone will be able to...
As we previously reported, iOS 26 enhances Apple Wallet app boarding passes in a few ways. First, the passes now support Live Activities, allowing you to keep track of a flight at a glance on your iPhone's Lock Screen, and in the Dynamic Island on the iPhone 14 Pro and newer. In addition, new shortcuts below the passes provide one-tap access to Apple Maps for airport directions, and to the Find...