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以下命令下载1.7.2，但我需要拉取最新版本。我该怎么做？
rvm install jruby http://jruby.org.s3.amazonaws.com/downloads/1.7.2/jruby-bin-1.7.2.tar.gz - #configure jruby-1.7.2 - #download
您需要更新 RVM：
rvm get head rvm install jruby