[Zope] Upgrading to 2.1.2

Hello All, having seen the security problem with 2.1.1 i have got 2.1.2, but no where can i find any information about upgrading from my 2.11 to 2.1.2 with out doing a fresh install. Is there a way to simply upgrade to 2.1.2 with out reinstalling everything ?? Or am i blind as a rivetted bulk head and missed the obvious documentation ? Regards Tom Wright thomas.wright1@btinternet.com