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: https://support.apple.com/kb/HT201222
You can install the update by selecting System Preferences... from the Apple menu at the top left of your screen, then choosing Software Update.
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