rspec-rails: `cannot load such file -- capybara/dsl` on `require 'rspec/rails'`, am I doing it wrong?

I created a new rails project that does not depend on capybara, but does depend on rspec-rails. It 'splodes when I require 'rspec/rails'.

Failure/Error: require 'rspec/rails'

LoadError:
  cannot load such file -- capybara/dsl