I can't play Team Fortress 2 anymore...

I get a message saying "The server you are trying to connect to is using an older version of this game."
and then get "disconnected" - what does this mean... am I THAT over the hill?

Please advise... I know the blitz competition has already started - I don't wanna miss out!
I can't play Team Fortress 2 anymore...

I get a message saying "The server you are trying to connect to is using an older version of this game."
and then get "disconnected" - what does this mean... am I THAT over the hill?

Please advise... I know the blitz competition has already started - I don't wanna miss out!
I wanted to try out TF2 aswell today and got the same message. I think it's dead

Steam updates, it's back now.