Apple has released macOS Big Sur 11.6.6 and a security update to macOS Catalina 10.15.7, bringing minor updates to the last-generation Mac operating systems likely focused on security fixes and under-the-hood improvements.
It isn't yet clear what specific fixes or updates are included in macOS 11.6.6 or macOS 10.15.7, but they're likely to be minor with no major user-facing features.
Apple last provided an update to macOS Big Sur in March with the release of macOS Big Sur 11.6.5, which addressed a number of security vulnerabilities. Prior to that, Apple updated the macOS Big Sur platform in February with macOS 11.6.4.
The macOS Monterey 12.4 update on Monday similarly contained minor under-the-hood improvements and bug fixes.
Apple first released macOS Big Sur in November 2020. The update brought an number of major changes to the Mac operating system, including a user interface redesign and support for Apple Silicon.