rails Could not find devise-1.4.6 in any of the sources (trying to run rspec tests)

I try to run spec tests and I get

bundle exec rake spec
Could not find selenium-webdriver-2.6.0 in any of the sources

So I bundle and I get:

bundle Fetching source index for http://rubygems.org/ Could not find devise-1.4.6 in any of the sources

So I try to install devise 1.4.6 but I get

gem install devise -v1.4.6
ERROR:  Could not find a valid gem 'devise' (= 1.4.6) in any repository
ERROR:  Possible alternatives: devise

Which is really strange as my Gem file itself just has 'Devise' (no version number).

The rest of my Gem file is below.

I have also done rake test:prepare and the database and table exists in test.

cat Gemfile
source 'http://rubygems.org'

gem 'rake', '0.9.2'
gem 'rails', '3.1.0'
gem 'haml'
gem 'simple_form'
gem 'devise'
gem 'mysql2'
gem 'therubyracer'
# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails', "  ~> 3.1.0"
  gem 'coffee-rails', "~> 3.1.0"
  gem 'uglifier'
end
gem 'jquery-rails'
# To use debugger
# gem 'ruby-debug19', :require => 'ruby-debug'
group :test, :development do
#  gem 'cucumber-rails', '0.5.0'
  gem 'capybara'#, '开发者_开发技巧1.0.0.beta1'
  gem 'database_cleaner'#, '0.6.7'
  gem "rspec-rails", "~> 2.6"
#  gem 'forgery', '0.3.8'
  gem "forgery"
  gem 'factory_girl'#, '1.3.3'
  gem 'factory_girl_rails'#, '1.0.1'
  gem 'shoulda'#, '2.11.3'
  gem 'rcov'
  gem 'turn', :require => false  # Pretty printed test output
end

Yes, it has been yanked, see here:

1.4.6 September 19, 2011 yanked

It is reading your Gemfile.lock so you need to run bundle update