[CentOS] ruby on rails

CentOS 4.2 (ruby-gems-0.8.11)

cd ~

mkdir ruby-db
cd ruby-db
$ rails th-db

    Rails requires Ruby version 1.8.2 (2004-12-25) or later.
    You're running 1.8.1 (2003-12-25); please upgrade to continue.

;-(

Am I going to have to use Fedora on this server to use rails?

Craig