Nintendo has rolled out a new system update for the Switch 2. This brings the firmware up to ver. 20.1.5, but as is often the case, Nintendo is characteristically vague about what the update has changed.
According to the official patch notes, the new firmware update makes “general system stability improvements to enhance the user’s experience.” No other details were provided beyond that.
The update should automatically download when you connect your system to the internet. However, you can also manually install it by opening the System Settings menu from the home screen and selecting System Update.