OS X Mountain Lion: Keep your Mac up to date
Periodically, Apple releases free updates to your computer’s software. You can check for updates manually or set your Mac to check for updates automatically. These updates include important security updates that protect your computer from potential threats.
If you’re looking for a specific update and don’t see it in the Mac App Store, you can search for it on the Apple Support Downloads website.
Check for updates manually
Choose Apple menu > Software Update.
The Mac App Store opens. Any available updates are listed.
Set your Mac to check for updates automatically
- Choose Apple menu > System Preferences, and then click Software Update.
- Select “Automatically check for updates.”
If you want your Mac to download updates without asking, select “Download newly available updates in the background.”
If you want your Mac to install system files and security updates automatically, select “Automatically install system data files and security updates.”
Available updates appear in the Mac App Store.