Apple releases macOS Catalina 10.15.4 supplemental update with FaceTime bug fix and more

Earlier today, Apple released watchOS 6.2.1 to address a lingering FaceTime Audio bug. Before that, iOS 13.4.1 and iPadOS 13.4.1 were released to the public as well. And now it’s macOS Catalina‘s turn.

On Wednesday, Apple officially released macOS Catalina 10.15.4 supplemental update to the public. It’s a minor update, and it’s designed to address a few issues with the desktop operating system. The first and most important, a bug related to FaceTime Audio that would prevent some macOS Catalina-equipped machines from connecting to a FaceTime call with other devices running iOS iOS 9.3.6 and earlier, and OS X El Capitan 10.11.6 and earlier.

The new software also adds a few other fixes in there for good measure. Here’s the official changelog:

macOS Catalina 10.15.4 supplemental update improves the stability and security of your Mac.

  • Fixes an issue where Mac computers running macOS Catalina 10.15.4 could not participate in FaceTime calls with devices running iOS 9.3.6 and earlier or OS X El Capitan 10.11.6 and earlier
  • Resolves an issue where you may repeatedly receive a password prompt for an Office 365 account
  • Fixes an issue where MacBook Air (Retina, 13-inch, 2020) may hang in Setup Assistant or when disconnecting and reconnecting a 4K or 5K external display
  • Resolves an issue where a USB-C port in your Mac may become unresponsive


Some features may not be available for all regions, or on all Apple devices. For detailed information about the security content of this update, please visit:

The new supplemental update for macOS Catalina 10.15.4 is available now for users. If you have automatic updates switched on, your Mac will upgrade on its own. However, if you prefer to update your software manually you can open the System Preferences app –> Software Update and then follow the instructions on the screen.