How to downgrade bundler or upgrade rails?
Try the following commands:
gem uninstall bundler
gem install bundler --version '1.0.0'
To install downgraded version of bundler, try:
gem install bundler --version '<= 0.10.6'
so you could have both version installed (check: gem list bundler
/bundler _0.9.26_ -v
), then run using that specific version, e.g.:
bundle _0.9.26_ install
Learn more: How to upgrade/downgrade Rubygems at rubyforge