How to update your server
Do you need to update your version of Garry’s Mod to the latest release? This article will tell you how to check and download an update for Garry’s Mod.
Much like the client version, the dedicated server is powered by Steam, which means that it handles automatic updates for you. Since the server will check for updates when it is turned on, there is no additional configuration on your end. All you need to do is reboot your server, and as part of the boot process, any updates will be automatically downloaded and applied. If you are unsure on how to do this, please read this article here on how to reboot a server.