Can anyone please tell me if every release of ZCS (say 5.0.3 just out) includes the latest version of Spam Assassin, or is only every updated every major release?

Is there anywhere that describes what version of spam assassin is included with every release as I cannt find it.

Is it worth upgrading each minor release to keep on top of new spam techniques being used by spammers, or does this update automatically?

thanks for the advice.

BTW, I'm a 20 user network version of 5.0.1 in a UK SME.