Macos Big Sur 11.5.1 (20g80) May 2026

: Despite being a single-patch update, the download size was approximately 2.2 GB for Intel Macs and over 3.1 GB for M1 Macs . Improvements from the 11.5 Branch

: 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)

: Resolved an issue where smart cards might not work correctly when logging into M1-based Macs. Installation & Compatibility : Despite being a single-patch update, the download

: Updated the Library tab to allow users to see all shows or only followed shows. Installation & Compatibility : Updated the Library tab

: Apple stated they were aware of reports that this issue may have been actively exploited in the wild.

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

: Available for all Macs compatible with Big Sur, including MacBook (2015+), MacBook Air (2013+), and iMac (2014+).