diff --git a/Gemfile b/Gemfile
index bf249f6..33c3cec 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,6 +7,7 @@ gem 'appraisal'
 gem 'fastimage'
 gem 'sqlite3'
 gem 'aws-sdk-s3'
+gem 'sidekiq', '~> 2.0'
 
 gem 'test-unit'
 gem 'thoughtbot-shoulda', '>= 2.9.0'
diff --git a/gemfiles/rails_42.gemfile b/gemfiles/rails_42.gemfile
index 6a11f6e..569d1d6 100644
--- a/gemfiles/rails_42.gemfile
+++ b/gemfiles/rails_42.gemfile
@@ -6,6 +6,7 @@ gem "appraisal"
 gem "fastimage"
 gem "sqlite3"
 gem "aws-sdk-s3"
+gem "sidekiq", "~> 2.0"
 gem "test-unit"
 gem "thoughtbot-shoulda", ">= 2.9.0"
 gem "mocha"
diff --git a/gemfiles/rails_5.gemfile b/gemfiles/rails_5.gemfile
index 4118642..e3f2ff6 100644
--- a/gemfiles/rails_5.gemfile
+++ b/gemfiles/rails_5.gemfile
@@ -6,6 +6,7 @@ gem "appraisal"
 gem "fastimage"
 gem "sqlite3"
 gem "aws-sdk-s3"
+gem "sidekiq", "~> 2.0"
 gem "test-unit"
 gem "thoughtbot-shoulda", ">= 2.9.0"
 gem "mocha"
diff --git a/lib/paperclip.rb b/lib/paperclip.rb
index d2a7b34..b1ac0eb 100644
--- a/lib/paperclip.rb
+++ b/lib/paperclip.rb
@@ -27,7 +27,6 @@
 
 require 'tempfile'
 require 'fastimage'
-require 'sidekiq'
 require 'paperclip/upfile'
 require 'paperclip/iostream'
 require 'paperclip/geometry'
diff --git a/lib/paperclip/storage/delayeds3.rb b/lib/paperclip/storage/delayeds3.rb
index dd80b6a..62b9d62 100644
--- a/lib/paperclip/storage/delayeds3.rb
+++ b/lib/paperclip/storage/delayeds3.rb
@@ -1,8 +1,10 @@
+require 'sidekiq'
+require 'aws-sdk-s3'
+
 module Paperclip
   module Storage
     # Need to create boolean field synced_to_s3
     module Delayeds3
-      # require 'aws-sdk'
       module ClassMethods
         def parse_credentials creds
           return @parsed_credentials if @parsed_credentials
diff --git a/paperclip.gemspec b/paperclip.gemspec
index 36fe58d..e2fdfb8 100644
--- a/paperclip.gemspec
+++ b/paperclip.gemspec
@@ -16,6 +16,4 @@ Gem::Specification.new do |s|
   s.rubyforge_project = %q{paperclip}
   s.rubygems_version = %q{1.3.1}
   s.summary = %q{File attachments as attributes for ActiveRecord}
-
-  s.add_dependency('sidekiq', ["~> 2.0"])
 end