Apple's fall software update reduces watchOS 27 compatibility to six Apple Watch models, cutting out a long tail of recent hardware.
At WWDC, Apple confirmed that the Series 6, 7, 8, first-generation Ultra, and second-generation SE will not receive watchOS 27 this fall, software that was developed for those devices but won't ship to them. Entry into the update requires a Series 9 or newer, starting at $399. The headline features are a reworked Siri capable of handling open-ended questions and sharing context across Apple devices, upgrades to the Workout Buddy fitness coach (now usable without an iPhone nearby and newly available in Spanish), and interface changes including a dynamic app grid and improved Smart Stack suggestions. Apple also cites performance gains in battery life, sleep tracking, and Wi-Fi connectivity.
The compatibility cut is the sharpest the Watch lineup has seen in years, but the feature slate doesn't obviously clear that bar. Apple Watch has hit the same diminishing-returns wall the iPhone did years ago: hardware capable enough that a 2020 Series 6 can still track workouts, monitor sleep, and respond to texts without a compelling reason to replace it. Siri AI is the marquee pitch, but Apple has positioned successive Siri overhauls as transformative for two consecutive update cycles, and the assistant's track record earns some skepticism about that framing.
Apple does continue issuing security patches for dropped devices for an unspecified period. It pushed an update for iOS 15, covering iPhones as old as the 2015 iPhone 6S, as recently as May 2026, so there's no immediate safety argument for upgrading either.