# System Update

*Tools → System Update* installs new versions of SAS Radius. When an update is available, system administrators also see a banner at the top of every page: *New Software Update Available*.

[![system update](https://help.snono-systems.com/uploads/images/gallery/2026-11/scaled-1680-/system-update.png)](https://help.snono-systems.com/uploads/images/gallery/2026-11/system-update.png)

- **New Update Available (version)** with the list of changes, and an **Install Update** button, when an update exists.
- **Your system is up to date** and a **Check Now** button when not.
- **Updates History** lists previous versions and their changes.

## Installing an update

1. Create and download a **backup** first (see [Backup and Restore](https://help.snono-systems.com/books/sas-radius/page/backup-and-restore)).
2. Choose a quiet time; services may restart during the update.
3. Click **Install Update**. A progress bar shows downloading and installing. Don't close the page.
4. When the update is installed, the page reloads by itself.
5. Check the version again; if more updates are listed, install them one by one.

<p class="callout warning">Custom changes made directly on the server (edited panel files or custom widgets) can be overwritten by an update.</p>

*Required permission: Managers - System Administrator*