Ruby 1.3.1-990215 is out, check out:

    ftp://ftp.netlab.co.jp/pub/lang/ruby/in.coming/ruby-1.3.1-990215.tar.gz

md5sum is

    b4d8d25bab9cbefe152f3c62ec588ff6  ruby-1.3.1-990215.tar.gz

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