I just did this.
https://github.com/discourse/discourse/commit/79e0cd7f529c14d482b2c5dc1394bc90d6070d56
and
https://github.com/discourse/discourse/commit/b301c9f6c12f517ee64e15599d7cac6ed2b9d7d8
and
https://github.com/discourse/discourse/commit/c234a14f0de458168adb5100cb7fd9d21a362d7d
This leaves, cppjieba, libv8 / mini_racer, nokogumbo, oj, pg and rinku
Regarding Rhino, you got to make sure the ruby rhino with latest GitHub - mozilla/rhino: Rhino is an open-source implementation of JavaScript written entirely in Java · GitHub It looks pretty silent there Commits · rubyjs/therubyrhino · GitHub . Ideally I would prefer v8, but at a minimum we would want latest Rhino.