Why is WatchOS 4 not showing up as an update for my original AppleWatch?
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howapple - hello
All Apple Watch models can be updated to watchOS 4 if the paired iPhone is an iPhone 5s or newer model that has first been updated to iOS 11.
Follow the instructions here, starting by making a backup of your iPhone:
- Update the iOS software on your iPhone, iPad, or iPod touch - Apple Support
- Update the software on your Apple Watch - Apple Support
If you instead have an iPhone 5 or 5c, then your devices cannot be updated beyond iOS 10.x and watchOS 3.x.