Update middleman.gemspec to enable (#2448)
Update middleman.gemspec to enable (#2448)

Probably to solve the same issue as here: https://github.com/jekyll/jekyll/issues/8523

(I am not really a rubyist, and in fact I'm installing since the ruby 3.0.0 release. Someone more knowledgeable should definitely double-check this before accepting it.)
middleman/middleman,middleman/middleman,middleman/middleman,middleman/middleman