tmux (1.3-1) unstable; urgency=low

  Due to an update in the server protocol from version 5 to version 6
  users need to terminate open tmux sessions before proceeding with
  updating tmux 1.2 or older.

 -- Karl Ferdinand Ebert <kfebert@gmail.com>  Fri, 23 Jul 2010 08:09:03 +0200

