Yesterday, Nintendo released minor update for the Switch and Switch Lite, bringing the software version up to 10.0.3 now. Version 10.0.2 came at the end of April and version 10.0.1 was a much smaller release with only very minor bug fixes.
Version 10.0.3 is more of the same, very minor bug fixes:
General system stability improvements to enhance the user’s experience
To update your Nintendo Switch, it can be done in the Settings section, but most consoles will update automatically.