Apple has released watchOS 8.4 with security updates and fixes for a bug that prevented some Watch Series models from charging.
This update is available for Watch Series 3 and above, and you can download it through the Apple Watch app on your iPhone by navigating to general > Software update menu.
Note that your Apple Watch needs to be at least 50% charged to install the update, and it should be on the charger while still within range of the connected iPhone.
In addition to watchOS 8.4, Apple also released the first beta of watchOS 8.5.You can Check out its release notes here.