How do you undo bundle install --without

Question

How do you undo running

bundle install --without development

Right now, I have gems in the development group that are being ignored because

Answer 1

The updated, correct answer is @caspyin's, here.

My answer is still here for historical purposes:

Bundler settings are stored in a file named .bundle/config. You can reset it by removing it, or removing the entire .bundle directory, like this:

rm -rfv .bundle

Or, if you're scared of rm -rf (it's OK, many people are):

rm .bundle/config
rmdir .bundle