This security release updates the native Windows "jruby" executables shipped in the bin directory. We received a report that several virus scanners will flag one of these executables, jrubyw.exe, as containing a virus. We scanned the systems used for building those executables, and were unable to find any evidence of infection, but as a precaution we have rebuilt those binaries on a known clean system for this release.
We have released JRuby 18.104.22.168 to address virus warnings about one of the Windows executables we ship. No other evidence of infection, but better safe than sorry!