gpg: DSA requires the use of a 160 bit hash algorithm

[Tapio Lehtonen <tale@iki.fi>]

I can't anymore sign e-mails using mutt. Error is

gpg: DSA requires the use of a 160 bit hash algorithm

What to do to fix this? I started getting the error after installing
spamassassin from testing to a woody host. I did had a working
spamassassin from woody, but upgraded it using the "How to keep a
mixed system" info, i.e.

apt-get -t unstable install spamassassin

I did install some other packages from testing also. 

-- 
Tapio Lehtonen
Tapio.Lehtonen@IKI.FI
GPG public key from http://www.iki.fi/Tapio.Lehtonen