11.5.1 (20g80) | Macos Big Sur

: Resolved an issue where smart cards might not work correctly when logging into M1-based Macs. Installation & Compatibility

While 11.5.1 was security-focused, it carries over the bug fixes introduced in 11.5 (20G71), including: macOS Big Sur 11.5.1 (20G80)

: This was a "surprise" security patch released just five days after version 11.5. : Resolved an issue where smart cards might

: This security fix was released simultaneously with iOS 14.7.1 and iPadOS 14.7.1 to address the same vulnerability. macOS 11.5.1 - Apple Wiki | Fandom macOS Big Sur 11.5.1 (20G80)

Released on July 26, 2021, is a maintenance update primarily focused on a critical security patch. Key Update Details

: Fixed an issue where the play count or last played date might not update in the library.