I tried to deploy on netlify and got hundreds of warnings :
11:27:42 AM: /opt/build/cache/bundle/ruby/2.7.0/gems/middleman-core-4.3.5/lib/middleman-core/util/paths.rb:36: warning: URI.unescape is obsolete
11:27:42 AM: /opt/build/cache/bundle/ruby/2.7.0/gems/middleman-core-4.3.5/lib/middleman-core/rack.rb:89: warning: URI.unescape is obsolete
11:27:42 AM: /opt/build/cache/bundle/ruby/2.7.0/gems/rb-inotify-0.10.0/lib/rb-inotify/watcher.rb:66: warning: rb_safe_level will be removed in Ruby 3.0
11:27:42 AM: /opt/build/cache/bundle/ruby/2.7.0/gems/middleman-core-4.3.5/lib/middleman-core/extensions/asset_hash.rb:90: warning: URI.escape is obsolete
I tried to deploy on netlify and got hundreds of warnings :
Even with these, in the end, it seems to work OK.