1. From the Apple menu  in the corner of your screen, choose System Preferences.
  2. Click Software Update.
  3. Click Update Now or Upgrade Now:
    • Update Now installs the latest updates for the currently installed version. Learn about macOS Big Sur updates, for example.
    • Upgrade Now installs a major new version with a new name, such as macOS Big Sur. Learn about the latest macOS upgrade, or about old versions of macOS that are still available.

If you're having difficulty finding or installing updates:

  • If Software Update says that your Mac is up to date, then macOS and all of the apps it installs are up to date, including Safari, Messages, Mail, Music, Photos, FaceTime, Calendar, and Books.
  • If you want to update apps downloaded from the App Store, use the App Store to get updates.
  • If you want to update your iOS device, learn how to update iPhone, iPad, or iPod touch.
  • If your Mac doesn't include Software Update, use the App Store to get updates.
  • If an error occurred while installing an update or upgrade, learn how to resolve installation issues.

Updating macOS can be a real chore sometimes, especially if you get stuck in an update loop because there isn’t enough free space. Some users started the update but found themselves stuck in this “boot loop” after it failed, returning to the update installer page every time their Mac booted up again. I own a MacBook Pro 13 inch with 128gb and this update was stressful. I had to move basically everything on Mac to an external ssd including the Big Sur installer. Whatever I moved the storage was not updating. I almost gave up but then I restarted my Mac and finally it showed there was enough space available.

Catalina

Why My Mac Is Not Updating

Most of the time, macOS should be able to resolve these issues gracefully, but occasionally it may cause your Mac to lock up halfway through the update. If your Mac encounters difficulties when downloading or installing the latest release, don’t panic! In this article, we share seven fixes that can fix your frozen Mac and get it back on track.