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:

Release notes

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.

Source: Nintendo