Apple has seeded the first release candidate of watchOS 10.6 to developers for testing. This follows the public release of watchOS 10.5 for Apple Watch in May.
This update provides important bug fixes and security updates and is recommended for all users.
For information on the security content of Apple software updates, please visit this website: https://support.apple.com/kb/HT201222
To install the build, developers should enable Developer Mode in Settings > Privacy & Security. Then, use the Watch app on iPhone to update the software.