Alongside the third betas of iOS 11.2.5, watchOS 4.2.2, and tvOS 11.2.5, Apple today seeded the third build of macOS High Sierra 10.13.3. to those registered to debug the Mac’s operating system. This comes after the second build of the update was released last year.
To install the build, head over to the “Updates” tab in the App Store and check for updates. There, you’ll find the new build ready to install. Just click the “Update” button next to the macOS High Sierra 10.13.3 beta listing and restart your Mac. The process may take a little while, so be patient and don’t turn off your Mac manually if you don’t have to.
So far, there hasn’t been any noticeable changes spotted in the new beta but we’ll let you know if we find anything down the line. As for now, it looks like only bug fixes and system stabilities are present.