diff --git a/.travis.yml b/.travis.yml
index a4012dd..bb0155a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,38 @@
 language: ruby
+
 rvm:
-  - 2.2.5
-  - 2.3.1
-  - 2.4.1
+  - 2.2.10
+  - 2.5.9
+  - 2.7.4
+  - 3.0.0
+
+env:
+  - RAILS_VERSION=4.2
+  - RAILS_VERSION=5.2
+  - RAILS_VERSION=6.0
+  - RAILS_VERSION=6.1
+
+jobs:
+  exclude:
+    - rvm: 2.2.10
+      env: RAILS_VERSION=5.2
+    - rvm: 2.2.10
+      env: RAILS_VERSION=6.0
+    - rvm: 2.2.10
+      env: RAILS_VERSION=6.1
+
+    - rvm: 2.5.9
+      env: RAILS_VERSION=4.2
+
+    - rvm: 2.7.4
+      env: RAILS_VERSION=4.2
+
+    - rvm: 3.0.0
+      env: RAILS_VERSION=4.2
+    - rvm: 3.0.0
+      env: RAILS_VERSION=5.2
+    - rvm: 3.0.0
+      env: RAILS_VERSION=6.0
 
 before_install:
   - gem install bundler -v 1.15
diff --git a/Gemfile b/Gemfile
index 5018971..fa1af8d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,3 +2,17 @@ source 'https://rubygems.org'
 
 # Specify your gem's dependencies in devise-async.gemspec
 gemspec
+
+version = ENV['RAILS_VERSION'] || "~> 6.1"
+
+gem "activerecord", version
+gem "actionpack", version
+gem "actionmailer", version
+
+if version =~ /^4/
+  gem 'sqlite3', '~> 1.3.6'
+elsif version =~ /^5.2/
+  gem 'sqlite3', '~> 1.3.6'
+else
+  gem 'sqlite3', '~> 1.4'
+end
diff --git a/README.md b/README.md
index 5c4d77c..7528adb 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Devise Async
 
-[![Tag](https://img.shields.io/github/tag/mhfs/devise-async.svg?style=flat-square)](https://github.com/mhfs/devise-async/releases) [![Build Status](https://img.shields.io/travis/mhfs/devise-async.svg?style=flat-square)](https://travis-ci.org/mhfs/devise-async) [![Code Climate](https://img.shields.io/codeclimate/github/mhfs/devise-async.svg?style=flat-square)](https://codeclimate.com/github/mhfs/devise-async)
+[![Build Status](https://app.travis-ci.com/joe1chen/devise-async.svg?branch=master)](https://app.travis-ci.com/github/joe1chen/devise-async)
 
 Devise Async provides an easy way to configure Devise to send its emails asynchronously using ActiveJob.
 
diff --git a/devise-async.gemspec b/devise-async.gemspec
index d36d7f9..e8a551e 100644
--- a/devise-async.gemspec
+++ b/devise-async.gemspec
@@ -19,13 +19,10 @@ Gem::Specification.new do |gem|
 
 
   gem.add_runtime_dependency 'devise', '>= 4.0'
-  gem.add_runtime_dependency 'activejob', '>= 5.0'
+  gem.add_runtime_dependency 'activejob', '>= 4.2'
 
-  gem.add_development_dependency 'activerecord', '>= 5.0'
-  gem.add_development_dependency 'actionpack',   '>= 5.0'
-  gem.add_development_dependency 'actionmailer', '>= 5.0'
   gem.add_development_dependency 'rspec',        '~> 3.6'
   gem.add_development_dependency 'rspec-rails',  '~> 3.6'
-  gem.add_development_dependency 'sqlite3',      '~> 1.3'
+  gem.add_development_dependency 'sqlite3'
   gem.add_development_dependency 'pry'
 end
diff --git a/lib/devise/async.rb b/lib/devise/async.rb
index 55dc51a..b268aa5 100644
--- a/lib/devise/async.rb
+++ b/lib/devise/async.rb
@@ -8,6 +8,10 @@ module Async
     mattr_accessor :enabled
     @@enabled = true
 
+    # Defines the queue in which the background job will be enqueued.
+    mattr_accessor :queue
+    @@queue = nil
+
     # Allow configuring Devise::Async with a block
     #
     # Example:
diff --git a/lib/devise/async/model.rb b/lib/devise/async/model.rb
index 0d7c208..6c6038d 100644
--- a/lib/devise/async/model.rb
+++ b/lib/devise/async/model.rb
@@ -1,3 +1,5 @@
+require 'action_mailer'
+
 module Devise
   module Models
     module Async
@@ -50,7 +52,12 @@ def devise_pending_notifications
       private
 
       def deliver_mail_later(notification, model, args)
-        devise_mailer.send(notification, model, *args).deliver_later
+        if ActionMailer::Base.method_defined?(:deliver_later_queue_name)
+          # Rails 5 introduced the option of setting the mailer queue name.
+          devise_mailer.send(notification, model, *args).deliver_later(queue: Devise::Async.queue || ActionMailer::Base.deliver_later_queue_name)
+        else
+          devise_mailer.send(notification, model, *args).deliver_later
+        end
       end
     end
   end
diff --git a/spec/devise/async_spec.rb b/spec/devise/async_spec.rb
index 54d89e8..cdc0cfc 100644
--- a/spec/devise/async_spec.rb
+++ b/spec/devise/async_spec.rb
@@ -10,4 +10,12 @@
     expect(described_class.enabled).to eq(false)
     described_class.enabled = initial_enabled
   end
+
+  it 'stores queue config' do
+    initial_queue = described_class.queue
+
+    described_class.queue = :critical
+    expect(described_class.queue).to eq(:critical)
+    described_class.queue = initial_queue
+  end
 end