Can't downgrade bundler

Question

I try to install a project I cloned. When I do 'bundle install' I have the following message:

$ bundle install
Bundler could not find compatible versions for gem "bundler":
In Gemfile:
rails (= 3.0.0) ruby depends on
bundler (~> 1.0.0) ruby

Current Bundler version:
bundler (1.6.2)

This Gemfile requires a different version of Bundler.
Perhaps you need to update Bundler by running `gem install bundler`?

So i did the following:

gem uninstall bundler
gem install bundler --version '1.0.0'
Successfully installed bundler-1.0.0
1 gem installed

I do 'bundle install', and I keep having the same message:

$ bundle install
Bundler could not find compatible versions for gem "bundler":
In Gemfile:
rails (= 3.0.0) ruby depends on
bundler (~> 1.0.0) ruby

Current Bundler version:
bundler (1.6.2)

This Gemfile requires a different version of Bundler.

Perhaps you need to update Bundler by running `gem install bundler`?

It seems that I cannot downgrade bundler to the '1.0.0' version, any idea?

Answer 1

If you do not need multiple versions of Bundler, you can uninstall the newer version:

$ gem uninstall bundler -v 1.6.2

You can also choose from a list of bundler versions if you have more than one:

$ gem uninstall bundler

Answer 2

You'll need to hit the global instance (alter installed ruby version as needed) --

$ gem uninstall -i /Users/<user>/.rvm/gems/ruby-2.3.8@global bundler