Here's a guide on how you can update your games on Nintendo Switch:

1. Open the main menu of the Nintendo console.
2. Navigate to "Settings" or "System Settings."
3. Select "Data Management" or "Software Update."
4. Choose the game that needs to be updated.
5. If an update is available, select "Update" and follow the on-screen instructions to update the game.

It is important to make sure that the console is connected to the Internet to check for and download updates. Also, please make sure that your console has enough memory to download and install the update.