freebsd-update: from 7.1-STABLE to 7.2-RELEASE?

[Axel]

Hello,

I have previously kept my machine updated by fetching the STABLE branch 
using csup and rebuilding the kernel. (As described in Handbook chapter 
24.7)

 From now on, I want to use freebsd-update to simplify the process and 
follow the RELEASE branch (+patches) instead.

But it seems that freebsd-update cannot help me upgrade from 7.1-STABLE 
to 7.2-RELEASE.

Any tips on how to make the transition to RELEASE?

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uname -a
FreeBSD <host> 7.1-STABLE FreeBSD 7.1-STABLE #0: Sat Jul 25 12:24:54 
CEST 2009
root@<host>:/usr/obj/usr/src/sys/GENERIC  i386

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freebsd-update -v debug -r 7.2-RELEASE upgrade
Looking up update.FreeBSD.org mirrors... 3 mirrors found.
Fetching public key from update5.FreeBSD.org... fetch: 
http://update5.FreeBSD.org/7.1-STABLE/i386/pub.ssl: Not Found
failed.
Fetching public key from update4.FreeBSD.org... fetch: 
http://update4.FreeBSD.org/7.1-STABLE/i386/pub.ssl: Not Found
failed.
Fetching public key from update1.FreeBSD.org... fetch: 
http://update1.FreeBSD.org/7.1-STABLE/i386/pub.ssl: Not Found
failed.
No mirrors remaining, giving up.

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