Apple on Monday seeded the third beta of macOS Sierra 10.12.3 to developers. The third beta comes three weeks after the release of the second beta version of Apple’s upcoming Mac operating system.
The first beta of macOS Sierra 10.12.3 – build 16D25a – is available for download via the Apple Developer Center, or via the “Update” tab in the Mac App Store.
At this point, we don’t know what new features and improvements are included in the new beta seed. Apple’s official release notes merely say the new beta “improves the stability, compatibility, and security of your Mac.” We’ll let you know in this space as we find out any new features, changes, or bug fixes.