Apple has released two updates for Apple Watch, with versions watchOS 6.1.3 and watchOS 5.3.5. The latter update is aimed at older iPhone owners who cannot run the latest versions of iOS.
The two updates are available from the Watch app on iPhone, going to the section General> Software Update. The availability of the update may also be notified automatically on Apple Watch when connected.
watchOS 6.1.3 is available for users with an iPhone running iOS 13 or later, while watchOS 5.3.5 it is available for users with older iPhones, on which the latest version of iOS cannot be run.
The two updates include improvements and bug fixes. The most important problem solved by this update concerns a bug that, in some cases, did not send the irregular heartbeat notification on the Apple Watch in Iceland.