Galaxy Watch 4 and Watch 4 Classic Will Not Receive One UI 9 Watch
Samsung's Galaxy Watch 4 and Galaxy Watch 4 Classic will not receive the One UI 9 Watch update, according to Engadget, which published the report on 31 October 2026.
The same report says Galaxy Watch 5, Galaxy Watch 5 Pro and newer models will receive One UI 9 Watch by the end of 2026. That makes the Watch 5 generation the oldest eligible device in the lineup, and the year-end date is the timeline to watch for owners of those models.
The Galaxy Watch 4 lineup was released in 2021. Over its support life it received four major OS upgrades: One UI Watch 4.5, One UI 5 Watch, One UI 6 Watch and One UI 8 Watch. The Galaxy Watch 4 also marked Samsung's move from its in-house Tizen OS to a custom-skinned Wear OS, Google's smartwatch platform with Samsung's interface on top. The generation therefore sits at a platform boundary that its successors do not share.
Samsung's Galaxy Watch 9 and Galaxy Watch Ultra 2 launched with One UI 9 Watch. Samsung offers five major OS upgrades for these two models, one more than the four offered for their predecessor Watch models, according to the same report.
Samsung's health-companion service for the Galaxy Watch Ultra2 and Watch9 carries its own hardware and software prerequisite. In a Samsung newsroom post dated 22 July 2026, the company states the service is only available with Galaxy Watch7 or newer running One UI 9 Watch or newer. Under that wording, Galaxy Watch 4 and Watch 5 models are outside the eligible set regardless of their update status. The same post states that the health-companion feature requires at least 7 days of activity records, so a new wearer will not see a full feature set on day one.
The broader context here is the gap between platform support and feature support. An OS version tells a developer which kernel, runtime and API surface the device exposes. A vendor-gated service layered on top can set its own device floor and data prerequisites, much as a building may require a key card for one floor even though the lobby door is open to everyone. Buyers comparing a Watch 5 and a Watch 7 generation on paper may find that the OS roadmap and the feature roadmap diverge.
In my view, the most useful number in the report for prospective buyers is the upgrade count, not the year. Five major OS upgrades on the Watch 9 and Ultra 2 extend the expected software horizon of those devices by one generation compared with the Watch 4 cohort, which gives a longer window in which a wearable's sensors, APIs and companion apps can keep evolving. Whether that window holds in practice will depend on how Samsung and its partners support the platform in the coming years.
For owners of the Watch 4 and Watch 4 Classic, the practical question is what remains supported and what does not. The update path ends with the One UI 8 Watch release, and the One UI 9 Watch update is not on their list.
