Unstable has 5.97 in the repositories, so you can get it from there. You can try:
Code:
apt-get -t unstable install coreutils
It might throw a fit over upgrading just coreutils, it has a bit of a list of dependencies, but it might be ok. You can also try -t testing instead of -t unstable, I don't know what version of coreutils is in testing at the moment.
Peace,
JimBass