freebsd-update no mirrors?

[RW]

On Sun, 03 Jun 2012 12:47:47 +0100
Chris Whitehouse wrote:

> 
> c400# uname -a
> FreeBSD c400 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Tue Jan  3 07:15:25
> UTC 2012
> root at obrian.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
> 
> Following the handbook:
> 
> c400# freebsd-update -r 9-STABLE upgrade
>...
> Am I doing something wrong?

freebsd-update only works on release security branches - not
development branches.