Apple today released watchOS 5.3.2 for Apple Watch Series 1 and Apple Watch Series 2 devices.
watchOS 5.3.2 provides important 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
Note: watchOS 6 will be available for Apple Watch Series 1 and Apple Watch Series 2 later this fall.