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https://www.ruby-lang.org/en/news/2015/12/16/ruby-2-0-0-p648-released/ Please, read that. Ruby 2.0 will reach EOL on February 24, 2016. Please, upgrade.
Thank you for your report. Nevertheless, since we keep our API/ABI promise, we won't upgrade Ruby to the newer major version in base RHEL7, but we keep fixing bugs if they should be critical and of course we keep providing security fixes. If you need more recent versions, please consider using Red Hat Software Collections.