[Rails] Re: Delayed job in Rails 4

I gem file I added this:

gem 'delayed_job_active_record'

Then when I bundled, this happened:

$ bundle
Fetching gem metadata from https://rubygems.org/..........
Fetching gem metadata from https://rubygems.org/..
Resolving dependencies...
Bundler could not find compatible versions for gem "activesupport":
In Gemfile:
delayed_job_active_record (>= 0) ruby depends on
activesupport (~> 3.0) ruby

sass-rails (~> 4.0.0) ruby depends on
activesupport (4.0.0)

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