Update macOS
- Go to the System Settings app  on your Mac. on your Mac.
- Click General  in the sidebar. (You may need to scroll down.) in the sidebar. (You may need to scroll down.)
- Click Software Update. - The Software Update settings show the currently installed version of macOS and whether an update is available. 
- Click Update Now, then follow the onscreen instructions. 
Note: For more information, see the Apple Support article Update macOS on Mac.