Apple today released watchOS 4.2, the second major update to the watchOS 4 operating system that runs on the Apple Watch. watchOS 4.2 comes a little over one month after the release of watchOS 4.1, the first major update to watchOS 4 that brought Apple Music streaming over LTE.
https://www.macrumors.com/2017/12/05/apple-releases-watchos-4-2/
https://www.macrumors.com/2017/12/05/apple-releases-watchos-4-2/