thoughtbot/shoulda-matchers — comment on commit 6b4035c11783a0588e78d3705bb9425b9b5f45b8
File:  line 0
By 3den:

@gabebw @joshuaclayton the problem is because shoulda.gemspec still loading old version of shoulda matchers https://github.com/thoughtbot/shoulda/blob/master/shoulda.gemspec