what is the latest os update for mac
macOS The fall release of macOS 10.13 High Sierra was announced on June 5, 2017 at Apple's WWDC event.[215] On September 12, 2017 at Apple's iPhone event, they announced its release to be September 25, 2017.[216] Like OS X El Capitan and OS X Mountain Lion, High Sierra is a refinement-based update having very few new features.[217] High Sierra uses the new Apple File System and includes enhancements to Safari, Photos, and Mail, among other changes.[215]