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

1. Launch the Steam client on your computer.
2. Go to your Library, where all your installed games are listed.
3. Look for the game that needs to be updated in the list.
4. If an update is available, the game title will have an update icon next to it (a downward arrow).
5. Right-click on the game and select "Update" from the context menu.
6. Steam will begin downloading and installing the update automatically.
7. Once the update is complete, you can launch the game and play the updated version.

Steam has automatic updates enabled by default, so in most cases, games will update automatically when a new version is available. However, you can also manually trigger updates as described above if needed.

Note: The exact steps and interface may vary slightly depending on the version of the Steam Launcher.