Rumor: Apple Watch Series 4 won’t upgrade to watchOS 11
The watch was released in 2018. Currently, it is the oldest of the supported Apple Watch models.
The Apple Watch Series 3 lost support after the release of watchOS 9 in 2022, and last year’s watchOS 10 update was compatible with all the same Apple Watch models as watchOS 9.
According to iPhoneSoft, all models starting from Apple Watch Series 5 and newer, including both generations of Apple Watch SE, will receive support for watchOS 11.