Apple today announced macOS Sierra, the latest version of its Mac software platform and renamed successor to OS X El Capitan. The first beta of the update was seeded to developers earlier today, while a public beta will be released in July.
macOS Sierra will be available as a free software update for compatible MacBook, MacBook Air, MacBook Pro, iMac, Mac mini, and Mac Pro models in the fall. Many 2007 to 2009 Macs that are compatible with OS X El Capitan will not be upgradeable to macOS Sierra, as the cutoff is now at least Late 2009.
The official list of Macs compatible with macOS Sierra:
- MacBook Air
- MacBook Pro
- Mac mini
- Mac Pro
To determine your Mac's model year, click on the Apple logo in the top-left menu bar and select About This Mac. The model year is listed in the main Overview tab.