SteamCMD GMod Dev Branch

Hey guys, I’m having a problem with SteamCMD and updating Garry’s Mod. For some reason it keeps updating with the dev branch even known I haven’t told it to. All I’m using is “app_update 4020 validate” but it still seems to go into the dev branch. Anyone know why I’m having this problem and how I could opt out of it? Thanks in advance.

You’re probably opted into the Dev branch in Steam. Try opting out and then updating your server.