Apple has launched a supplemental update to its 10.15.4 macOS Catalina update, which brings fixes to several issues, including a bug which prevented Catalina users from participating in certain FaceTime calls and a bug that rendered the USB-C port on a Mac unresponsive.

Since this is a supplemental update and not a standalone one, the new Catalina version has the same version number as the last one.

Here's a complete list of changes, per Apple's release notes:

• 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

Apple's macOS Catalina has been fairly buggy from the get go, with numerous issues plaguing users ever since the software's release in October 2019. For a full list of updates since then, go here.

You can install the update by going to the System Preferences app and clicking on Software Update.