Just like with your iPod touch, iPhone and iPad you will periodically need to upgrade your Apple Watch software to eliminate bugs and take advantage of new features. You can check for software updates in the Apple Watch app on your iPhone under My Watch > General > Software Update.
If an update is available you can download the new software to your iPhone, then wake your Apple Watch and follow the prompts to install the software.
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On your iPhone, tap on Apple Watch app to open it, and then: My Watch > General > Software Update > Tap on Download and Install to download the latest Watch OS. Enter the passcode if it requires.
Tap Agree to the Terms and Conditions.
Tap Install on your iPhone or your Apple Watch.
resource:
http://www.imobie.com/support/update-apple-watch-operating-system.htm