diff --git a/delayed_paperclip.gemspec b/delayed_paperclip.gemspec
index 8be11da..52880ab 100644
--- a/delayed_paperclip.gemspec
+++ b/delayed_paperclip.gemspec
@@ -12,6 +12,7 @@ Gem::Specification.new do |s|
   s.homepage    = %q{http://github.com/jrgifford/delayed_paperclip}
 
   s.add_dependency 'paperclip', [">= 3.3"]
+  s.add_dependency 'activejob', ">= 4.2"
 
   s.add_development_dependency 'mocha'
   s.add_development_dependency "rspec", '< 3.0'
diff --git a/lib/delayed_paperclip.rb b/lib/delayed_paperclip.rb
index a5e96b2..b1d2904 100644
--- a/lib/delayed_paperclip.rb
+++ b/lib/delayed_paperclip.rb
@@ -1,4 +1,4 @@
-require 'delayed_paperclip/jobs'
+require 'delayed_paperclip/jobs/active_job'
 require 'delayed_paperclip/attachment'
 require 'delayed_paperclip/url_generator'
 require 'delayed_paperclip/railtie'
@@ -6,23 +6,15 @@
 module DelayedPaperclip
 
   class << self
-
     def options
       @options ||= {
-        :background_job_class => detect_background_task,
+        :background_job_class => DelayedPaperclip::Jobs::ActiveJob,
         :url_with_processing  => true,
         :processing_image_url => nil,
         :queue => "paperclip"
       }
     end
 
-    def detect_background_task
-      return DelayedPaperclip::Jobs::ActiveJob  if defined? ::ActiveJob::Base
-      return DelayedPaperclip::Jobs::DelayedJob if defined? ::Delayed::Job
-      return DelayedPaperclip::Jobs::Resque     if defined? ::Resque
-      return DelayedPaperclip::Jobs::Sidekiq    if defined? ::Sidekiq
-    end
-
     def processor
       options[:background_job_class]
     end
diff --git a/lib/delayed_paperclip/jobs.rb b/lib/delayed_paperclip/jobs.rb
deleted file mode 100644
index cf07d24..0000000
--- a/lib/delayed_paperclip/jobs.rb
+++ /dev/null
@@ -1,8 +0,0 @@
-module DelayedPaperclip
-  module Jobs
-    autoload :ActiveJob,  'delayed_paperclip/jobs/active_job'
-    autoload :DelayedJob, 'delayed_paperclip/jobs/delayed_job'
-    autoload :Resque,     'delayed_paperclip/jobs/resque'
-    autoload :Sidekiq,    'delayed_paperclip/jobs/sidekiq'
-  end
-end
diff --git a/lib/delayed_paperclip/jobs/delayed_job.rb b/lib/delayed_paperclip/jobs/delayed_job.rb
deleted file mode 100644
index 3e6ba1c..0000000
--- a/lib/delayed_paperclip/jobs/delayed_job.rb
+++ /dev/null
@@ -1,46 +0,0 @@
-require 'delayed_job'
-require 'active_support/deprecation'
-
-module DelayedPaperclip
-  module Jobs
-    class DelayedJob < Struct.new(:instance_klass, :instance_id, :attachment_name)
-
-      # This is available in newer versions of DelayedJob. Using the newee Job api thus.
-      if Gem.loaded_specs['delayed_job'].version >= Gem::Version.new("2.1.0")
-
-        def self.enqueue_delayed_paperclip(instance_klass, instance_id, attachment_name)
-          ActiveSupport::Deprecation.warn(<<-MESSAGE)
-Using DelayedJob adapter for delayed_paperclip is deprecated and will be removed in version 3.0.0.
-Please use ActiveJob adapter.
-          MESSAGE
-
-          ::Delayed::Job.enqueue(
-            :payload_object => new(instance_klass, instance_id, attachment_name),
-            :priority => instance_klass.constantize.paperclip_definitions[attachment_name][:delayed][:priority].to_i,
-            :queue => instance_klass.constantize.paperclip_definitions[attachment_name][:delayed][:queue]
-          )
-        end
-
-      else
-
-        def self.enqueue_delayed_paperclip(instance_klass, instance_id, attachment_name)
-          ActiveSupport::Deprecation.warn(<<-MESSAGE)
-Using DelayedJob adapter for delayed_paperclip is deprecated and will be removed in version 3.0.0.
-Please use ActiveJob adapter.
-          MESSAGE
-
-          ::Delayed::Job.enqueue(
-            new(instance_klass, instance_id, attachment_name),
-            instance_klass.constantize.paperclip_definitions[attachment_name][:delayed][:priority].to_i,
-            instance_klass.constantize.paperclip_definitions[attachment_name][:delayed][:queue]
-          )
-        end
-
-      end
-
-      def perform
-        DelayedPaperclip.process_job(instance_klass, instance_id, attachment_name)
-      end
-    end
-  end
-end
diff --git a/lib/delayed_paperclip/jobs/resque.rb b/lib/delayed_paperclip/jobs/resque.rb
deleted file mode 100644
index 5528aed..0000000
--- a/lib/delayed_paperclip/jobs/resque.rb
+++ /dev/null
@@ -1,22 +0,0 @@
-require 'resque'
-require 'active_support/deprecation'
-
-module DelayedPaperclip
-  module Jobs
-    class Resque
-      def self.enqueue_delayed_paperclip(instance_klass, instance_id, attachment_name)
-        @queue = instance_klass.constantize.paperclip_definitions[attachment_name][:delayed][:queue]
-        ::Resque.enqueue(self, instance_klass, instance_id, attachment_name)
-
-        ActiveSupport::Deprecation.warn(<<-MESSAGE)
-Using Resque adapter for delayed_paperclip is deprecated and will be removed in version 3.0.0.
-Please use ActiveJob adapter.
-        MESSAGE
-      end
-
-      def self.perform(instance_klass, instance_id, attachment_name)
-        DelayedPaperclip.process_job(instance_klass, instance_id, attachment_name)
-      end
-    end
-  end
-end
diff --git a/lib/delayed_paperclip/jobs/sidekiq.rb b/lib/delayed_paperclip/jobs/sidekiq.rb
deleted file mode 100644
index 80aede0..0000000
--- a/lib/delayed_paperclip/jobs/sidekiq.rb
+++ /dev/null
@@ -1,30 +0,0 @@
-require 'sidekiq/worker'
-require 'active_support/deprecation'
-
-module DelayedPaperclip
-  module Jobs
-    class Sidekiq
-      include ::Sidekiq::Worker
-
-      def self.enqueue_delayed_paperclip(instance_klass, instance_id, attachment_name)
-        ActiveSupport::Deprecation.warn(<<-MESSAGE)
-Using Sidekiq adapter for delayed_paperclip is deprecated and will be removed in version 3.0.0.
-Please use ActiveJob adapter.
-        MESSAGE
-
-        queue_name = instance_klass.constantize.paperclip_definitions[attachment_name][:delayed][:queue]
-        # Sidekiq >= 4.1.0
-        if respond_to?(:set)
-          set(:queue => queue_name)
-        else
-          sidekiq_options :queue => queue_name
-        end
-        perform_async(instance_klass, instance_id, attachment_name)
-      end
-
-      def perform(instance_klass, instance_id, attachment_name)
-        DelayedPaperclip.process_job(instance_klass, instance_id, attachment_name)
-      end
-    end
-  end
-end
diff --git a/spec/delayed_paperclip/attachment_spec.rb b/spec/delayed_paperclip/attachment_spec.rb
index b2a5739..f84a838 100644
--- a/spec/delayed_paperclip/attachment_spec.rb
+++ b/spec/delayed_paperclip/attachment_spec.rb
@@ -2,7 +2,7 @@
 
 describe DelayedPaperclip::Attachment do
   before :each do
-    DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::Resque
+    DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::ActiveJob
     reset_dummy(dummy_options)
   end
 
diff --git a/spec/delayed_paperclip/class_methods_spec.rb b/spec/delayed_paperclip/class_methods_spec.rb
index 8118167..c778fca 100644
--- a/spec/delayed_paperclip/class_methods_spec.rb
+++ b/spec/delayed_paperclip/class_methods_spec.rb
@@ -2,7 +2,7 @@
 
 describe DelayedPaperclip::ClassMethods do
   before :each do
-    DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::Resque
+    DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::ActiveJob
     reset_dummy(with_processed: false)
   end
 
diff --git a/spec/delayed_paperclip/instance_methods_spec.rb b/spec/delayed_paperclip/instance_methods_spec.rb
index ec7ee03..25b7766 100644
--- a/spec/delayed_paperclip/instance_methods_spec.rb
+++ b/spec/delayed_paperclip/instance_methods_spec.rb
@@ -2,7 +2,7 @@
 
 describe DelayedPaperclip::InstanceMethods do
   before :each do
-    DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::Resque
+    DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::ActiveJob
     reset_dummy
   end
 
diff --git a/spec/delayed_paperclip/url_generator_spec.rb b/spec/delayed_paperclip/url_generator_spec.rb
index 0fcd437..54fee52 100644
--- a/spec/delayed_paperclip/url_generator_spec.rb
+++ b/spec/delayed_paperclip/url_generator_spec.rb
@@ -2,7 +2,7 @@
 
 describe DelayedPaperclip::UrlGenerator do
   before :each do
-    DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::Resque
+    DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::ActiveJob
     reset_dummy(dummy_options)
   end
 
diff --git a/spec/delayed_paperclip_spec.rb b/spec/delayed_paperclip_spec.rb
index 2cb4f23..8a39626 100644
--- a/spec/delayed_paperclip_spec.rb
+++ b/spec/delayed_paperclip_spec.rb
@@ -8,12 +8,12 @@
 
   context "with Resque adapter" do
     before :each do
-      DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::Resque
+      DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::ActiveJob
     end
 
     describe ".options" do
       it ".options returns basic options" do
-        DelayedPaperclip.options.should == {:background_job_class => DelayedPaperclip::Jobs::Resque,
+        DelayedPaperclip.options.should == {:background_job_class => DelayedPaperclip::Jobs::ActiveJob,
                                             :url_with_processing => true,
                                             :processing_image_url => nil,
                                             :queue => "paperclip"}
@@ -22,13 +22,13 @@
 
     describe ".processor" do
       it ".processor returns processor" do
-        DelayedPaperclip.processor.should == DelayedPaperclip::Jobs::Resque
+        DelayedPaperclip.processor.should == DelayedPaperclip::Jobs::ActiveJob
       end
     end
 
     describe ".enqueue" do
       it "delegates to processor" do
-        DelayedPaperclip::Jobs::Resque.expects(:enqueue_delayed_paperclip).with("Dummy", 1, :image)
+        DelayedPaperclip::Jobs::ActiveJob.expects(:enqueue_delayed_paperclip).with("Dummy", 1, :image)
         DelayedPaperclip.enqueue("Dummy", 1, :image)
       end
     end
diff --git a/spec/integration/base_delayed_paperclip_spec.rb b/spec/integration/base_delayed_paperclip_spec.rb
index 1127c06..7cd767a 100644
--- a/spec/integration/base_delayed_paperclip_spec.rb
+++ b/spec/integration/base_delayed_paperclip_spec.rb
@@ -2,7 +2,7 @@
 
 describe "Base Delayed Paperclip Integration" do
   before :each do
-    DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::Resque
+    DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::ActiveJob
     Resque.remove_queue(:paperclip)
   end
 
diff --git a/spec/integration/delayed_job_spec.rb b/spec/integration/delayed_job_spec.rb
deleted file mode 100644
index 7581311..0000000
--- a/spec/integration/delayed_job_spec.rb
+++ /dev/null
@@ -1,63 +0,0 @@
-require 'spec_helper'
-require 'delayed_job'
-
-Delayed::Worker.backend = :active_record
-
-describe "Delayed Job" do
-  before :each do
-    DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::DelayedJob
-    build_delayed_jobs
-  end
-
-  let(:dummy) { Dummy.new(:image => File.open("#{ROOT}/fixtures/12k.png")) }
-
-  describe "integration tests" do
-    include_examples "base usage"
-  end
-
-  describe "perform job" do
-    before :each do
-      DelayedPaperclip.options[:url_with_processing] = true
-      reset_dummy
-    end
-
-    it "performs a job" do
-      dummy.image = File.open("#{ROOT}/fixtures/12k.png")
-      Paperclip::Attachment.any_instance.expects(:reprocess!)
-      dummy.save!
-      Delayed::Job.last.payload_object.perform
-    end
-
-    it "is deprecated" do
-      ActiveSupport::Deprecation.expects(:warn)
-
-      dummy.image = File.open("#{ROOT}/fixtures/12k.png")
-      Paperclip::Attachment.any_instance.expects(:reprocess!)
-      dummy.save!
-      Delayed::Job.last.payload_object.perform
-    end
-  end
-
-  def process_jobs
-    Delayed::Worker.new.work_off
-  end
-
-  def jobs_count(queue = nil)
-    Delayed::Job.count
-  end
-
-  def build_delayed_jobs
-    ActiveRecord::Base.connection.create_table :delayed_jobs, :force => true do |table|
-      table.integer  :priority, :default => 0      # Allows some jobs to jump to the front of the queue
-      table.integer  :attempts, :default => 0      # Provides for retries, but still fail eventually.
-      table.text     :handler                      # YAML-encoded string of the object that will do work
-      table.string   :last_error                   # reason for last failure (See Note below)
-      table.datetime :run_at                       # When to run. Could be Time.now for immediately, or sometime in the future.
-      table.datetime :locked_at                    # Set when a client is working on this object
-      table.datetime :failed_at                    # Set when all retries have failed (actually, by default, the record is deleted instead)
-      table.string   :locked_by                    # Who is working on this object (if locked)
-      table.string   :queue
-      table.timestamps null: true
-    end
-  end
-end
diff --git a/spec/integration/resque_spec.rb b/spec/integration/resque_spec.rb
deleted file mode 100644
index 008f9fe..0000000
--- a/spec/integration/resque_spec.rb
+++ /dev/null
@@ -1,47 +0,0 @@
-require 'spec_helper'
-require 'resque'
-
-describe "Resque" do
-  before :each do
-    DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::Resque
-    Resque.remove_queue(:paperclip)
-  end
-
-  let(:dummy) { Dummy.new(:image => File.open("#{ROOT}/fixtures/12k.png")) }
-
-  describe "integration tests" do
-    include_examples "base usage"
-  end
-
-  describe "perform job" do
-    before :each do
-      DelayedPaperclip.options[:url_with_processing] = true
-      reset_dummy
-    end
-
-    it "performs a job" do
-      dummy.image = File.open("#{ROOT}/fixtures/12k.png")
-      Paperclip::Attachment.any_instance.expects(:reprocess!)
-      dummy.save!
-      DelayedPaperclip::Jobs::Resque.perform(dummy.class.name, dummy.id, :image)
-    end
-
-    it "is deprecated" do
-      ActiveSupport::Deprecation.expects(:warn)
-
-      dummy.image = File.open("#{ROOT}/fixtures/12k.png")
-      Paperclip::Attachment.any_instance.expects(:reprocess!)
-      dummy.save!
-      DelayedPaperclip::Jobs::Resque.perform(dummy.class.name, dummy.id, :image)
-    end
-  end
-
-  def process_jobs
-    worker = Resque::Worker.new(:paperclip)
-    worker.process
-  end
-
-  def jobs_count(queue = :paperclip)
-    Resque.size(queue)
-  end
-end
diff --git a/spec/integration/sidekiq_spec.rb b/spec/integration/sidekiq_spec.rb
deleted file mode 100644
index 3ceb805..0000000
--- a/spec/integration/sidekiq_spec.rb
+++ /dev/null
@@ -1,54 +0,0 @@
-require 'spec_helper'
-require 'sidekiq/testing'
-
-describe "Sidekiq" do
-  before :each do
-    Sidekiq.logger.level = Logger::ERROR
-    DelayedPaperclip.options[:background_job_class] = DelayedPaperclip::Jobs::Sidekiq
-    Sidekiq::Queues["paperclip"].clear
-  end
-
-  let(:dummy) { Dummy.new(:image => File.open("#{ROOT}/fixtures/12k.png")) }
-
-  describe "integration tests" do
-    include_examples "base usage"
-  end
-
-  describe "perform job" do
-    before :each do
-      DelayedPaperclip.options[:url_with_processing] = true
-      reset_dummy
-    end
-
-    it "performs a job" do
-      dummy.image = File.open("#{ROOT}/fixtures/12k.png")
-      Paperclip::Attachment.any_instance.expects(:reprocess!)
-      dummy.save!
-      DelayedPaperclip::Jobs::Sidekiq.new.perform(dummy.class.name, dummy.id, :image)
-    end
-
-    it "is deprecated" do
-      ActiveSupport::Deprecation.expects(:warn)
-
-      dummy.image = File.open("#{ROOT}/fixtures/12k.png")
-      Paperclip::Attachment.any_instance.expects(:reprocess!)
-      dummy.save!
-      DelayedPaperclip::Jobs::Sidekiq.new.perform(dummy.class.name, dummy.id, :image)
-    end
-  end
-
-  def process_jobs
-    Sidekiq::Queues["paperclip"].each do |job|
-      worker = job["class"].constantize.new
-      args   = job["args"]
-      begin
-        worker.perform(*args)
-      rescue # Assume sidekiq handle exception properly
-      end
-    end
-  end
-
-  def jobs_count(queue = "paperclip")
-    Sidekiq::Queues[queue].size
-  end
-end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index ad8d234..e62a324 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -5,10 +5,8 @@
 require 'rspec'
 require 'fakeredis/rspec'
 require 'mocha/api'
-begin
-  require 'active_job'
-rescue LoadError
-end
+
+require 'active_job'
 
 begin
   require 'pry'
@@ -28,9 +26,6 @@
   ActiveRecord::Base.raise_in_transactional_callbacks = true
 end
 
-require "active_support/deprecation"
-ActiveSupport::Deprecation.silenced = true
-
 # Connect to sqlite
 ActiveRecord::Base.establish_connection(
   "adapter" => "sqlite3",
@@ -57,7 +52,7 @@
 
 def reset_global_default_options
   DelayedPaperclip.options.merge!({
-    :background_job_class => DelayedPaperclip::Jobs::Resque,
+    :background_job_class => DelayedPaperclip::Jobs::ActiveJob,
     :url_with_processing  => true,
     :processing_image_url => nil
   })