Apple released watchOS 6.1.3 for the Apple Watch 1 and later, as well as watchOS 5.3.5 for people with iPhones not capable of running iOS 13.
See here: Latest OS versions
Updates released by Apple today:
iPadOS 13.4, iOS 13.4, iOS 12.4.6 for older devices
tvOS 13.4; tvOS 7.5 for the Apple TV 3rd generation
watchOS 6.2; watchOS for 5.3.6 for those not capable of the latest software
HomePod OS 13.4
macOS Catalina 10.15.4, security updates for macOS Mojave and High Sierra
Updates released by Apple today:
iPadOS 13.4, iOS 13.4, iOS 12.4.6 for older devices
tvOS 13.4; tvOS 7.5 for the Apple TV 3rd generation
watchOS 6.2; watchOS for 5.3.6 for those not capable of the latest software
HomePod OS 13.4
macOS Catalina 10.15.4, security updates for macOS Mojave and High Sierra
Apple released iOS/iPadOS 13.4.1 which fixes a FaceTime bug.
iCloud for Windows 7 and later has been updated (7.18), as well as for Windows 10 and later (10.9.3).
Safari 13.1 has been released for macOS High Sierra, Mojave and Catalina.
There’s also an update for Xcode (11.4) for macOS Mojave and later.