This is really about about guard/guard-rails
There are depreciation warnings about run_on_change. I noticed you already updated this gem (johnbintz/guard-rails); can you update the guard/guard-rails gem as well? I couldn't submit an issue there. Is that gem unsupported now?

DEPRECATION: Starting with Guard v1.1 the use of the 'run_on_change' method in the 'Guard::Rails' guard is deprecated.
Please consider replacing that method-call with 'run_on_changes' if the type of change
is not important for your usecase or using either 'run_on_modifications' or 'run_on_additions'
based on the type of the changes you want to handle.
For more information on how to update existing guards, please head over to:
https://github.com/guard/guard/wiki/Upgrade-guide-for-existing-guards-to-Guard-v1.1