Update your apps to use new features, and test your apps against API changes.
The macOS 10.15.1 SDK provides support for developing apps for Macs running macOS Catalina 10.15.1. The SDK comes bundled with Xcode 11.2 available from the Mac App Store. For information on the compatibility requirements for Xcode 11.2, see Xcode 11.2 Release Notes.
Fixed an issue where Safari might stop responding when attempting to use Apple Pay on the Web. (56261377)
Support has been added for the AMD Navi RDNA architecture.
You can now filter by Favorites, Edited, Photos, Videos or Keywords in the new All Photos view. (45589765)
You can now choose View > Metadata > Titles to enable titles and filenames in the new All Photos view. (48363059)