I have a couple of older static sites (one using Jekyll/Octopress, one using Middleman), and if I ever do a bundle update something is guaranteed to break. Not sure if that's the "bloat" the parent comment is talking about though.

I've been using Perl Template::Toolkit since around 2001 and it's even better since version 3 was released. Worth a try. You don't even need to know Perl to make use of it.

Yes. I was on Jekyll 2 years ago, I don’t think I’ll be able to compile it in two years. It’s already on an old version of Ruby if I remember, if not Bundle or Gulp or... and it’s just a simple website.

I've had this exact issue with my Middleman sites.