To Update Your Mac
1/ open the App Store program on your Mac:
2/ click on the Updates tab at the top of the App Store window:
3/ click the “Update” button beside an item or the “Update All” button at the at the top.
Some updates will take a while to download and after, may require a restart for installation.
4/ after you have installed all of the Updates, go back to the App Store and check its status: