You can manually update the app on your Mac in the following way:
- Open the App Store.
- In the sidebar, click “Updates”.
- Click “Update” next to an app to update only that app, or click “Update All”.
In order to turn on automatic updates, do the following:
- Open the App Store.
- From the menu bar at the top of the screen, choose App Store > Preferences.
- Select “Automatic Updates”.