Apple on Monday seeded beta one of macOS Mojave 10.14.3 to developers. The new seed comes just five days after the release of macOS Mojave 10.14.2, which addressed an issue with external displays and included other bug fixes and performance improvements.
The software, build 18D21c, can be installed by registered developers through Apple’s developer portal, or through the macOS Software Update tool.
No word on what, if any new, features the new beta brings. However, it is likely the new beta includes performance improvements and bug fixes for issues found since the release of macOS 10.14.2 almost a week ago.