Dependabot can't resolve your Ruby dependency files

[dependabot-preview]

Dependabot can't resolve your Ruby dependency files.

As a result, Dependabot couldn't update your dependencies.

The error Dependabot encountered was:

Bundler::VersionConflict with message: Bundler could not find compatible versions for gem "coffee-script":
  In Gemfile:
    coffee-rails (~> 4.1.0) was resolved to 4.1.1, which depends on
      coffee-script (>= 2.2.0)

Could not find gem 'coffee-script (>= 2.2.0)', which is required by gem 'coffee-rails (~> 4.1.0)', in any of the sources.

Bundler could not find compatible versions for gem "json":
  In Gemfile:
    json (>= 1.8.6, <= 2.1.0)

    mailgun_rails was resolved to 0.8.0, which depends on
      json (>= 1.7.7)

    sdoc (~> 0.4.0) was resolved to 0.4.1, which depends on
      json (~> 1.7, >= 1.7.7)

    simplecov was resolved to 0.16.1, which depends on
      json (>= 1.8, < 3)

If you think the above is an error on Dependabot's side please don't hesitate to get in touch - we'll do whatever we can to fix it.

You can mention @dependabot in the comments below to contact the Dependabot team.