App Store keeps track of updates for apps you purchased with your Apple Account.
When an update is available, you receive a notification. You also see a badge on the App Store icon in the Dock and a number next to Updates in the sidebar that shows the number of updates available.
Update from the App Store
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Go to the App Store app
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Click Updates in the sidebar, then click Update beside each app that you want to update, or click Update All.
Update from the Apple menu
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Choose Apple menu
The number of updates appears next to App Store in the menu.
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To get your updates, click App Store.
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After App Store opens, click Updates in the sidebar to see available updates in the App Store.
Update from a notification
If you receive a notification that an app update is available, click Install. (Or click Close to dismiss the notification.)
Automatically keep apps up to date
You can automatically download and install app updates.
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Go to the App Store app
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Choose App Store > Settings, then select Automatic Updates.