We’ve released a new version in order to fix some issues detected in 0.27.1: https://crystal-lang.org/2019/02/05/crystal-0.27.2-released.html
The full changelog is here: https://github.com/crystal-lang/crystal/releases/tag/0.27.2
All the usual installation methods still apply: https://crystal-lang.org/docs/installation/ . For homebrew OSX users, the formula should be updated soon https://github.com/Homebrew/homebrew-core/pull/36750
Happy crystalling!