Before updating your iOS device, back it up. To install iOS 9.1 through your device, go to Settings > Software Update and install it over the air (you can also read a complete list of what’s included in the update). Or connect your device to a computer and upgrade using iTunes.
The new watchOS 2.1 is 57.1MB and includes the following:
Support for system language in Arabic, Czech, Greek, Hebrew, Malay, Portuguese (Portugal), and Vietnamese.
Support for Right-to-Left user interface
Fixes in the Calendar complication, Power reserve mode, and third-party app launching
To update your Apple Watch, open the Apple Watch app on your iPhone and tap My Watch > General > Software Update. The watch must be charged to at least 50 percent, connected to its charger, and in Bluetooth range of your iPhone.