thoughtbot/capybara-webkit — pull request #525 by AndreyChernyh (2013-05-11 13:05:55+00:00)
Title: Warn user if he using old json version (related #1020)

Related: https://github.com/jnicklas/capybara/issues/1020

Not sure if it worth to add appraisals with different json versions and actually add a compatibility code instead of warning.