Ruby 1.3.1-990224 is out, check out:

    ftp://ftp.netlab.co.jp/pub/lang/ruby/devel/ruby-1.3.1-990224.tar.gz

md5sum is

    b5618396d7c1ad8c2c4fc6a0aedff5cc  ruby-1.3.1-990224.tar.gz

Notice this is early access release, try it at your own risk.