Can't force gems to a specific version in Rails 3 application

After a bundle update, I want to rollback some gem versions to a specific one. I've tried several options, but I can't do it.

Say I want to use arel in its 2.0.9 version. I did t开发者_开发技巧he following:

sudo gem uninstall arel -v 2.0.10

Then in the Gemfile:

gem 'arel', '~> 2.0.9'

And then:

bundle update

Then I get:

Installing arel (2.0.10)

I also tried with gem cleanup and deleting Gemfile.lock, but no.. I allways get the same arel 2.0.10 installed. Am I missing something? Thank you very much!

You're telling it to install any patch version greater than or equal to 2.0.9. If you want to specifically install that version just do this:

gem 'arel', '2.0.9'