rbenv/ruby-build v20140919 on GitHub

If installed as an rbenv plugin:

cd `rbenv root`/plugins/ruby-build && git pull origin master

If installed via Homebrew:

brew up && brew upgrade ruby-build

Manual install:

git clone https://github.com/sstephenson/ruby-build.git
cd ruby-build
PREFIX=/usr/local ./install.sh

rbenv/ruby-build v20140919 ruby-build 20140919 on GitHub