We don't control what gets put on the apt repositories. It's up to the linux distro to decide what version to include.
It's a lot of work to poke the distro maintainers and tell them to update, and we don't have the manpower to do that all the time. And Nim isn't important enough for them to keep up to date proactively. This isn't just a Nim problem. Many projects are like this. That is why it is important to check the versions of things you get off apt vs. the project website itself.
