Configure Automatic Updates on OS X 10.9 or later

In order to ensure that your Mac will automatically check for and install OS X updates as well as other updates for Mac software, follow the configuration steps below.
Note: In OS X 10.8 and later, all system updates take place through the App Store application.

1. In the Apple menu, select System Preferences.
   Result: The System Preferences window appears.
   
2. Click on the App Store icon.
   Result: The Software Update information is displayed.
   
3. Check the box to the left of Automatically check for updates as well as the box to the left of Download newly available updates in the background and Install system data files and security updates. The last option for "Install app updates" is optional.

Tip: Click Check Now to immediately check for updates.