Even though major developments for macOS Sequoia and Sonoma are over, there will be security updates for some time. A couple weeks ago we saw a flurry of updates for existing and established versions of Apple’s OSes, with macOS 15.6 being among them. Despite how new this Sequoia update is, we’re already seeing an RC version of 15.7 seeded to developers. This typically indicates yet another security and/or bug fix update.
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Development timeline of this Sequoia update
- Previous macOS update 15.6 finalized and sent out on: July 30th, 2025 (Build 24G84)
. - August 5th, 2025: macOS Sequoia 15.7 Build 24G207 (RC1)
. - August 11th 2025: macOS Sequoia 15.7 Build 24G210 (RC2)
 2018 mini on 15.6 24G84 |
 2018 mini on 15.7 24G210 |
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Development timeline of this Sonoma update
- Previous macOS update 14.7.7 finalized and sent out on: July 29th, 2025 (Build 23H723)
. - August 5th, 2025: macOS Sequoia 14.8 Build 23J8 (RC1)
. - August 11th, 2025: macOS Sequoia 14.8 Build 23J10 (RC2)
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An interesting insight from 9to5Mac
“The internal software identifiers for the macOS 14.8 and 15.7 release candidates indicate that they pull security fixes from the macOS 26 development cycle. This means Apple is backporting security patches that will be released with macOS 26, ensuring users on macOS 14 and 15 won’t be exposed to vulnerabilities addressed in the upcoming release.” See: Apple rolls out RC versions of macOS 15.7 and 14.8 betas to developers [Update] – Article paragraph link to highlight.
It is also mentioned on AppleInsider how Apple is likely fast-tracking the updates to patch critical vulnerabilities. See: macOS Sonoma & macOS Sequoia get release candidates for future bug fix update
