how to recover gem 1.5.0 to gem 1.4.0

my rail开发者_如何学运维s can't work in gem 1.5.0 and how to recover it to the old version any helps would be thanks

Just specify the version in your Gemfile and do a 'bundle install'

gem 'gemname', '1.4.0'

Assuming you are not using Bundler uninstall the newer gem and then install the old with the --version = flag

gem uninstall yourgem
gem install yourgem --verion=1.4.0

If you want to downgrade your gem from 1.5.0 to 1.4.0 all you need to do is:

gem update --system 1.4.0