Keep your Mac up to date
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On your Mac, choose Apple menu
> System Preferences, then click Software Update. -
To automatically install macOS updates, select “Automatically keep my Mac up to date”.
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To set advanced update options, click Advanced, then do any of the following:
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To have your Mac check for updates automatically, select “Check for updates”.
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To have your Mac download updates without asking, select “Download new updates when available”.
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To have your Mac install macOS updates automatically, select “Install macOS updates”.
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To have your Mac install app updates from the App Store automatically, select “Install app updates from the App Store”.
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To have your Mac install system files and security updates automatically, select “Install system data files and security updates”.
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Click OK.
To receive the latest updates automatically, it’s recommended that you select “Check for updates”, “Download new updates when available” and “Install system data files and security updates”.
Note: MacBook, MacBook Pro and MacBook Air must have the power adapter plugged in to automatically download updates.