Do minor updates cause version mismatches?

My client is offering to update. I was connected to a server minutes before closing and re-launching the game. Since it is only a minor update, can I patch and still get back into this server or will I be locked out until the admin updates it?

Any update can cause a mismatch. Your client probably updated automatically, and now you wont be able to connect to the server until its up to date as well.