According to Cordell

Guard and Unresolved specs

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While using bundle exec guard I was recieving the following types of warnings:

15:30:07 - INFO - Running all specs
WARN: Unresolved specs during Gem::Specification.reset:
      ffi (>= 0.5.0)
WARN: Clearing out unresolved specs.
Please report a bug if this causes problems.

bundle update did not resolve this problem.

gem cleanup {gem name} resolved some of these problems but not completely.

Only by running bundle clean --force was I able to remove these warnings. Be forewarned though that this command does appear to remove gems which may require you to run bundle install again on other projects.