Recent languages like Go compiles a project into a nice executable, why can't good ol' Ruby? We have built an packer for Ruby to do just that. It is 100% open-source, and can produce executables for Windows, macOS and Linux individually. By packing, distributing Ruby apps are made extremely easy, additionally with intellectual property protection. Auto-updating is also made easy, in that the executable only needs to download and replace itself. So, how we did it? How to use it? What goes under the hood? What future will this bring to Ruby? That's what will be unraveled in this talk!