Error console GMOD after update

Yesterday the GMod update fucked up my server (error : the server you are trying to connect to is runing an older version of the game).
I updated it from my control panel and still have an error on the console : Host_Error: Unexepected authentication protocol 61134675!
Maybe the whole noob of me updated GMod in wrong way?

Thanks in advance !

i’ve the same problem with my server, it’s the last update is breaking server