Update your apps to use new features, and test your apps against API changes.
The watchOS 5.1 SDK provides support for developing watchOS apps for Apple Watch devices running watchOS 5.1.3. The SDK comes bundled with Xcode 10.1 available from the Mac App Store. For information on the compatibility requirements for Xcode 10.1, see Xcode Release Notes.
ECG sessions are no longer interrupted by incoming notifications. (46502715)