JRuby is a fast, compliant Ruby implementation which can make use of many features of the Java platform. We are rapidly nearing completion of our next version, JRuby 9000. JRuby 9000 is a major release featuring Ruby 2.1 compliance, a new runtime implementation, rewritten IO subsystem, and several other large changes. We are also making some new tooling to make memory management problems easier to diagnose as a Ruby programmer. Come hear about the status of JRuby 9000 and why this will be our best release yet.