Ruby 1.3.1-990225 is out, check out:

    ftp://ftp.netlab.co.jp/pub/lang/ruby/devel/ruby-1.3.1-990225.tar.gz

md5sum is

    ecb53d585acb86943eaccca1230d3003  ruby-1.3.1-990225.tar.gz

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