Apple today released watchOS 7.6.1, a minor update to the watchOS 7 operating system that was released in September 2020. watchOS 7.6.1 comes two weeks after the release of watchOS 7.6, an update that brought ECG capabilities to new regions.

‌‌The watchOS 7.6.1 update‌‌ can be downloaded for free through the dedicated Apple Watch app on the ‌iPhone‌ by going to General > Software Update.

To install the new software, the Apple Watch needs to have at least 50 percent battery, it needs to be placed on a charger, and it needs to be in range of the ‌‌‌‌‌‌‌‌‌‌iPhone‌‌‌‌‌‌‌‌‌‌.

According to Apple's release notes, the watchOS 7.6.1 update includes important security updates and it is recommended for all users. An Apple security support document indicates that the update fixes a memory issue that may have been actively exploited in the wild, so Apple Watch users should upgrade as soon as possible. This is the same issue that Apple previously addressed in iOS 14.7.1 and macOS Big Sur 11.5.1.

Source: Macrumors