Heroku Ruby version won't upgrade?
问题 I am struggling changing Ruby versions on Heroku. I use Ruby 2.0.0 with rails 4. My Gemfile has: source 'https://rubygems.org' ruby '2.0.0' ... The path in Heroku points to: $ heroku config -s | grep PATH PATH=bin:vendor/bundle/ruby/1.9.1/bin:/usr/local/bin:/usr/bin:/bin When I pushed my app, I could see: Fetching repository, done. Counting objects: 7, done. Delta compression using up to 4 threads. Compressing objects: 100% (4/4), done. Writing objects: 100% (4/4), 431 bytes | 0 bytes/s, done