Apple has just seeded a new build (13D55) of OS X Mavericks to developers. The update is currently showing for users on the beta from the Dev Center and doesn’t seem to be showing up yet for members of the recently-reopened AppleSeed program. This release is expected to include improved USB syncing in iTunes and enhanced support for 4k monitors on newer MacBook Pros.

Typically Apple increases the frequency of beta builds as it gets closer to the public release of a piece of software. The previous OS X build was released one week ago, indicating that Apple is possibly preparing to release 10.9.3 in the very near future. The full release notes for this build are below, and once again point developers to areas such as graphics and audio drivers, Safari, Mail, and iTunes USB syncing of contacts and calendars as key areas to test.

OS X Mavericks 10.9.3 build 13D55 Seed Note OS X Mavericks Update 10.9.3 is an update to OS X Mavericks 10.9. Installation Instructions Please be aware that you will not be able to revert back to your previous system after updating. Please install this update on a system you are prepared to erase if necessary. You can install this update using the OS X Software Update Seed Configuration Utility: – If you have already installed the “OS X Software Update Seed Configuration Utility”, choose “Software Update” from the Apple menu. Otherwise, proceed with the following steps. – Log into your Apple Developer account and download the “OS X Software Update Seed Configuration Utility”. – After running the installer, the Mac App Store will open automatically. Click on the Updates panel and the latest version of OS X Mavericks 10.9.3 seed will now be available for download. – When a newer seed build is available, you will receive a notification to update from the Mac App Store. Click the notification to begin the installation. New seed notes will be posted in the Mac Dev Center. – To stop receiving new seed builds, go to the App Store in System Preferences and where it says “Your computer is set to receive pre-release Software Update seeds”, press the “Change…” button. Note: If you are using a computer which gets its updates from a local Software Update server, the OS X Software Update Seed Configuration Utility will reconfigure your machine to use Apple’s Software Update servers. Your computer must be able to connect to Apple’s Software Update servers to install the seed. We recommend that you remove any Configuration Profile that specifies a local Software Update server before installing the OS X Software Update Seed Configuration Utility. Focus Areas – Graphics Drivers – Audio – Safari – Mail – Contacts & Calendar sync over USB in iTunes

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