diff --git a/Gemfile b/Gemfile
index 9f2e6c9..b4e1314 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,5 +4,5 @@ gemspec
 
 # jquery-rails is used by the dummy application
 gem "jquery-rails"
-
+gem 'activeresource'
 gem 'debugger'
diff --git a/Gemfile.lock b/Gemfile.lock
index 7f2e6e0..e34778b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,185 +1,192 @@
 PATH
   remote: .
   specs:
-    maily_herald (0.0.1)
+    maily_herald (0.8.0)
       liquid (~> 2.6.1)
-      rails (> 3.2)
+      rails (~> 4.0.0)
       sidekiq (~> 2.17.8)
 
 GEM
   remote: http://rubygems.org/
   specs:
-    actionmailer (3.2.18)
-      actionpack (= 3.2.18)
-      mail (~> 2.5.4)
-    actionpack (3.2.18)
-      activemodel (= 3.2.18)
-      activesupport (= 3.2.18)
-      builder (~> 3.0.0)
+    actionmailer (4.0.13)
+      actionpack (= 4.0.13)
+      mail (~> 2.5, >= 2.5.4)
+    actionpack (4.0.13)
+      activesupport (= 4.0.13)
+      builder (~> 3.1.0)
       erubis (~> 2.7.0)
-      journey (~> 1.0.4)
-      rack (~> 1.4.5)
-      rack-cache (~> 1.2)
-      rack-test (~> 0.6.1)
-      sprockets (~> 2.2.1)
-    activemodel (3.2.18)
-      activesupport (= 3.2.18)
-      builder (~> 3.0.0)
-    activerecord (3.2.18)
-      activemodel (= 3.2.18)
-      activesupport (= 3.2.18)
-      arel (~> 3.0.2)
-      tzinfo (~> 0.3.29)
-    activeresource (3.2.18)
-      activemodel (= 3.2.18)
-      activesupport (= 3.2.18)
-    activesupport (3.2.18)
-      i18n (~> 0.6, >= 0.6.4)
-      multi_json (~> 1.0)
-    arel (3.0.3)
-    builder (3.0.4)
+      rack (~> 1.5.2)
+      rack-test (~> 0.6.2)
+    activemodel (4.0.13)
+      activesupport (= 4.0.13)
+      builder (~> 3.1.0)
+    activerecord (4.0.13)
+      activemodel (= 4.0.13)
+      activerecord-deprecated_finders (~> 1.0.2)
+      activesupport (= 4.0.13)
+      arel (~> 4.0.0)
+    activerecord-deprecated_finders (1.0.4)
+    activeresource (4.0.0)
+      activemodel (~> 4.0)
+      activesupport (~> 4.0)
+      rails-observers (~> 0.1.1)
+    activesupport (4.0.13)
+      i18n (~> 0.6, >= 0.6.9)
+      minitest (~> 4.2)
+      multi_json (~> 1.3)
+      thread_safe (~> 0.1)
+      tzinfo (~> 0.3.37)
+    arel (4.0.2)
+    builder (3.1.4)
     celluloid (0.15.2)
       timers (~> 1.1.0)
     coderay (1.1.0)
-    columnize (0.8.9)
-    connection_pool (2.0.0)
-    database_cleaner (1.3.0)
+    columnize (0.9.0)
+    connection_pool (2.1.3)
+    database_cleaner (1.4.1)
     debugger (1.6.8)
       columnize (>= 0.3.1)
       debugger-linecache (~> 1.2.0)
       debugger-ruby_core_source (~> 1.3.5)
     debugger-linecache (1.2.0)
-    debugger-ruby_core_source (1.3.5)
+    debugger-ruby_core_source (1.3.8)
     diff-lcs (1.2.5)
-    docile (1.1.3)
+    docile (1.1.5)
     erubis (2.7.0)
-    factory_girl (4.4.0)
+    factory_girl (4.5.0)
       activesupport (>= 3.0.0)
-    factory_girl_rails (4.4.1)
-      factory_girl (~> 4.4.0)
+    factory_girl_rails (4.5.0)
+      factory_girl (~> 4.5.0)
       railties (>= 3.0.0)
-    ffi (1.9.3)
+    ffi (1.9.8)
     formatador (0.2.5)
-    guard (2.6.1)
+    guard (2.12.5)
       formatador (>= 0.2.4)
       listen (~> 2.7)
       lumberjack (~> 1.0)
+      nenv (~> 0.1)
+      notiffany (~> 0.0)
       pry (>= 0.9.12)
+      shellany (~> 0.0)
       thor (>= 0.18.1)
-    guard-rspec (4.2.10)
+    guard-compat (1.2.1)
+    guard-rspec (4.5.0)
       guard (~> 2.1)
-      rspec (>= 2.14, < 4.0)
+      guard-compat (~> 1.1)
+      rspec (>= 2.99.0, < 4.0)
     hike (1.2.3)
-    i18n (0.6.9)
-    journey (1.0.4)
-    jquery-rails (3.1.0)
+    i18n (0.7.0)
+    jquery-rails (3.1.2)
       railties (>= 3.0, < 5.0)
       thor (>= 0.14, < 2.0)
-    json (1.8.1)
-    liquid (2.6.1)
-    listen (2.7.7)
+    json (1.8.2)
+    liquid (2.6.2)
+    listen (2.9.0)
       celluloid (>= 0.15.2)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
-    lumberjack (1.0.6)
-    mail (2.5.4)
-      mime-types (~> 1.16)
-      treetop (~> 1.4.8)
+    lumberjack (1.0.9)
+    mail (2.6.3)
+      mime-types (>= 1.16, < 3)
     method_source (0.8.2)
-    mime-types (1.25.1)
-    multi_json (1.10.1)
-    polyglot (0.3.5)
-    pry (0.10.0)
+    mime-types (2.4.3)
+    minitest (4.7.5)
+    multi_json (1.11.0)
+    nenv (0.2.0)
+    notiffany (0.0.6)
+      nenv (~> 0.1)
+      shellany (~> 0.0)
+    pry (0.10.1)
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    rack (1.4.5)
-    rack-cache (1.2)
-      rack (>= 0.4)
-    rack-ssl (1.3.4)
-      rack
-    rack-test (0.6.2)
+    rack (1.5.2)
+    rack-test (0.6.3)
       rack (>= 1.0)
-    rails (3.2.18)
-      actionmailer (= 3.2.18)
-      actionpack (= 3.2.18)
-      activerecord (= 3.2.18)
-      activeresource (= 3.2.18)
-      activesupport (= 3.2.18)
-      bundler (~> 1.0)
-      railties (= 3.2.18)
-    railties (3.2.18)
-      actionpack (= 3.2.18)
-      activesupport (= 3.2.18)
-      rack-ssl (~> 1.3.2)
+    rails (4.0.13)
+      actionmailer (= 4.0.13)
+      actionpack (= 4.0.13)
+      activerecord (= 4.0.13)
+      activesupport (= 4.0.13)
+      bundler (>= 1.3.0, < 2.0)
+      railties (= 4.0.13)
+      sprockets-rails (~> 2.0)
+    rails-observers (0.1.2)
+      activemodel (~> 4.0)
+    railties (4.0.13)
+      actionpack (= 4.0.13)
+      activesupport (= 4.0.13)
       rake (>= 0.8.7)
-      rdoc (~> 3.4)
-      thor (>= 0.14.6, < 2.0)
-    rake (10.3.2)
+      thor (>= 0.18.1, < 2.0)
+    rake (10.4.2)
     rb-fsevent (0.9.4)
     rb-inotify (0.9.5)
       ffi (>= 0.5.0)
-    rdoc (3.12.2)
-      json (~> 1.4)
-    redcarpet (3.2.2)
-    redis (3.1.0)
-    redis-namespace (1.5.1)
+    redcarpet (3.2.3)
+    redis (3.2.1)
+    redis-namespace (1.5.2)
       redis (~> 3.0, >= 3.0.4)
-    rspec (3.0.0)
-      rspec-core (~> 3.0.0)
-      rspec-expectations (~> 3.0.0)
-      rspec-mocks (~> 3.0.0)
-    rspec-core (3.0.0)
-      rspec-support (~> 3.0.0)
-    rspec-expectations (3.0.0)
+    rspec (3.2.0)
+      rspec-core (~> 3.2.0)
+      rspec-expectations (~> 3.2.0)
+      rspec-mocks (~> 3.2.0)
+    rspec-core (3.2.3)
+      rspec-support (~> 3.2.0)
+    rspec-expectations (3.2.1)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.0.0)
-    rspec-mocks (3.0.1)
-      rspec-support (~> 3.0.0)
-    rspec-rails (3.0.1)
-      actionpack (>= 3.0)
-      activesupport (>= 3.0)
-      railties (>= 3.0)
-      rspec-core (~> 3.0.0)
-      rspec-expectations (~> 3.0.0)
-      rspec-mocks (~> 3.0.0)
-      rspec-support (~> 3.0.0)
-    rspec-support (3.0.0)
+      rspec-support (~> 3.2.0)
+    rspec-mocks (3.2.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.2.0)
+    rspec-rails (3.2.1)
+      actionpack (>= 3.0, < 4.3)
+      activesupport (>= 3.0, < 4.3)
+      railties (>= 3.0, < 4.3)
+      rspec-core (~> 3.2.0)
+      rspec-expectations (~> 3.2.0)
+      rspec-mocks (~> 3.2.0)
+      rspec-support (~> 3.2.0)
+    rspec-support (3.2.2)
+    shellany (0.0.1)
     sidekiq (2.17.8)
       celluloid (= 0.15.2)
       connection_pool (~> 2.0)
       json
       redis (~> 3.1)
       redis-namespace (~> 1.3)
-    simplecov (0.8.2)
+    simplecov (0.9.2)
       docile (~> 1.1.0)
-      multi_json
-      simplecov-html (~> 0.8.0)
-    simplecov-html (0.8.0)
-    slop (3.5.0)
-    spring (1.1.3)
-    spring-commands-rspec (1.0.2)
+      multi_json (~> 1.0)
+      simplecov-html (~> 0.9.0)
+    simplecov-html (0.9.0)
+    slop (3.6.0)
+    spring (1.3.4)
+    spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
-    sprockets (2.2.2)
+    sprockets (2.12.3)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)
       tilt (~> 1.1, != 1.3.0)
-    sqlite3 (1.3.9)
+    sprockets-rails (2.2.4)
+      actionpack (>= 3.0)
+      activesupport (>= 3.0)
+      sprockets (>= 2.8, < 4.0)
+    sqlite3 (1.3.10)
     thor (0.19.1)
+    thread_safe (0.3.5)
     tilt (1.4.1)
-    timecop (0.7.1)
+    timecop (0.7.3)
     timers (1.1.0)
-    treetop (1.4.15)
-      polyglot
-      polyglot (>= 0.3.1)
-    tzinfo (0.3.41)
+    tzinfo (0.3.43)
     yard (0.8.7.6)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
+  activeresource
   database_cleaner
   debugger
   factory_girl_rails
diff --git a/app/models/maily_herald/periodical_mailing.rb b/app/models/maily_herald/periodical_mailing.rb
index 3c64634..8e9bfca 100644
--- a/app/models/maily_herald/periodical_mailing.rb
+++ b/app/models/maily_herald/periodical_mailing.rb
@@ -46,7 +46,7 @@ def run
         if schedule.entity
           deliver_to schedule.entity
         else
-          MailyHerald.logger.log_processing(schedule.mailing, {:class => schedule.entity_type, :id => schedule.entity_id}, prefix: "Removing schedule for non-existing entity") 
+          MailyHerald.logger.log_processing(schedule.mailing, {class: schedule.entity_type, id: schedule.entity_id}, prefix: "Removing schedule for non-existing entity") 
           schedule.destroy
         end
       end
diff --git a/app/models/maily_herald/sequence.rb b/app/models/maily_herald/sequence.rb
index 5646824..229ff15 100644
--- a/app/models/maily_herald/sequence.rb
+++ b/app/models/maily_herald/sequence.rb
@@ -54,7 +54,7 @@ def run
         if schedule.entity
           schedule.mailing.deliver_to schedule.entity
         else
-          MailyHerald.logger.log_processing(schedule.mailing, {:class => schedule.entity_type, :id => schedule.entity_id}, prefix: "Removing schedule for non-existing entity") 
+          MailyHerald.logger.log_processing(schedule.mailing, {class: schedule.entity_type, id: schedule.entity_id}, prefix: "Removing schedule for non-existing entity") 
           schedule.destroy
         end
       end
diff --git a/maily_herald.gemspec b/maily_herald.gemspec
index 88067d1..c61a491 100644
--- a/maily_herald.gemspec
+++ b/maily_herald.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
   s.executables = s.files.grep(%r{^bin/}) { |f| File.basename(f) }
   s.test_files  = `git ls-files -- {spec,features}/**/`.split("\n")
 
-  s.add_dependency "rails", "> 3.2"
+  s.add_dependency "rails", "~> 4.0.0"
   s.add_dependency "liquid", "~> 2.6.1"
   s.add_dependency "sidekiq", "~> 2.17.8"
 
diff --git a/spec/dummy/config/environments/test.rb b/spec/dummy/config/environments/test.rb
index 078e758..b5bca8e 100644
--- a/spec/dummy/config/environments/test.rb
+++ b/spec/dummy/config/environments/test.rb
@@ -28,7 +28,7 @@
   # The :test delivery method accumulates sent emails in the
   # ActionMailer::Base.deliveries array.
   config.action_mailer.delivery_method = :test
-  ActionMailer::Base.default :from => "no-reply@foo.com>"
+  ActionMailer::Base.default from: "no-reply@foo.com>"
 
   # Raise exception on mass assignment protection for Active Record models
   config.active_record.mass_assignment_sanitizer = :strict
diff --git a/spec/dummy/db/schema.rb b/spec/dummy/db/schema.rb
index 3fcb124..5aa9b62 100644
--- a/spec/dummy/db/schema.rb
+++ b/spec/dummy/db/schema.rb
@@ -9,74 +9,74 @@
 # from scratch. The latter is a flawed and unsustainable approach (the more migrations
 # you'll amass, the slower it'll run and the greater likelihood for issues).
 #
-# It's strongly recommended to check this file into your version control system.
+# It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20150205120443) do
+ActiveRecord::Schema.define(version: 20150205120443) do
 
-  create_table "maily_herald_dispatches", :force => true do |t|
-    t.string   "type",                                          :null => false
+  create_table "maily_herald_dispatches", force: true do |t|
+    t.string   "type",                                       null: false
     t.integer  "sequence_id"
-    t.integer  "list_id",                                       :null => false
+    t.integer  "list_id",                                    null: false
     t.text     "conditions"
     t.text     "start_at"
     t.string   "mailer_name"
-    t.string   "name",                                          :null => false
+    t.string   "name",                                       null: false
     t.string   "title"
     t.string   "subject"
     t.string   "from"
-    t.string   "state",                 :default => "disabled"
+    t.string   "state",                 default: "disabled"
     t.text     "template"
     t.integer  "absolute_delay"
     t.integer  "period"
     t.boolean  "override_subscription"
-    t.datetime "created_at",                                    :null => false
-    t.datetime "updated_at",                                    :null => false
+    t.datetime "created_at"
+    t.datetime "updated_at"
   end
 
-  add_index "maily_herald_dispatches", ["name"], :name => "index_maily_herald_dispatches_on_name", :unique => true
+  add_index "maily_herald_dispatches", ["name"], name: "index_maily_herald_dispatches_on_name", unique: true
 
-  create_table "maily_herald_lists", :force => true do |t|
-    t.string "name",         :null => false
+  create_table "maily_herald_lists", force: true do |t|
+    t.string "name",         null: false
     t.string "title"
     t.string "context_name"
   end
 
-  create_table "maily_herald_logs", :force => true do |t|
-    t.integer  "entity_id",     :null => false
-    t.string   "entity_type",   :null => false
+  create_table "maily_herald_logs", force: true do |t|
+    t.integer  "entity_id",     null: false
+    t.string   "entity_type",   null: false
     t.string   "entity_email"
     t.integer  "mailing_id"
-    t.string   "status",        :null => false
+    t.string   "status",        null: false
     t.text     "data"
     t.datetime "processing_at"
   end
 
-  create_table "maily_herald_subscriptions", :force => true do |t|
-    t.integer  "entity_id",                       :null => false
-    t.integer  "list_id",                         :null => false
-    t.string   "entity_type",                     :null => false
-    t.string   "token",                           :null => false
+  create_table "maily_herald_subscriptions", force: true do |t|
+    t.integer  "entity_id",                    null: false
+    t.integer  "list_id",                      null: false
+    t.string   "entity_type",                  null: false
+    t.string   "token",                        null: false
     t.text     "settings"
     t.text     "data"
-    t.boolean  "active",       :default => false, :null => false
+    t.boolean  "active",       default: false, null: false
     t.datetime "delivered_at"
-    t.datetime "created_at",                      :null => false
-    t.datetime "updated_at",                      :null => false
+    t.datetime "created_at"
+    t.datetime "updated_at"
   end
 
-  create_table "products", :force => true do |t|
+  create_table "products", force: true do |t|
     t.string   "name"
-    t.datetime "created_at", :null => false
-    t.datetime "updated_at", :null => false
+    t.datetime "created_at"
+    t.datetime "updated_at"
   end
 
-  create_table "users", :force => true do |t|
+  create_table "users", force: true do |t|
     t.string   "name"
     t.string   "email"
-    t.boolean  "weekly_notifications", :default => true
-    t.boolean  "active",               :default => true
-    t.datetime "created_at",                             :null => false
-    t.datetime "updated_at",                             :null => false
+    t.boolean  "weekly_notifications", default: true
+    t.boolean  "active",               default: true
+    t.datetime "created_at"
+    t.datetime "updated_at"
   end
 
 end
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
new file mode 100644
index 0000000..ae56d53
--- /dev/null
+++ b/spec/rails_helper.rb
@@ -0,0 +1,50 @@
+# This file is copied to spec/ when you run 'rails generate rspec:install'
+ENV['RAILS_ENV'] ||= 'test'
+require 'spec_helper'
+require File.expand_path('../../config/environment', __FILE__)
+require 'rspec/rails'
+# Add additional requires below this line. Rails is not loaded until this point!
+
+# Requires supporting ruby files with custom matchers and macros, etc, in
+# spec/support/ and its subdirectories. Files matching `spec/**/*_spec.rb` are
+# run as spec files by default. This means that files in spec/support that end
+# in _spec.rb will both be required and run as specs, causing the specs to be
+# run twice. It is recommended that you do not name files matching this glob to
+# end with _spec.rb. You can configure this pattern with the --pattern
+# option on the command line or in ~/.rspec, .rspec or `.rspec-local`.
+#
+# The following line is provided for convenience purposes. It has the downside
+# of increasing the boot-up time by auto-requiring all files in the support
+# directory. Alternatively, in the individual `*_spec.rb` files, manually
+# require only the support files necessary.
+#
+# Dir[Rails.root.join('spec/support/**/*.rb')].each { |f| require f }
+
+# Checks for pending migrations before tests are run.
+# If you are not using ActiveRecord, you can remove this line.
+ActiveRecord::Migration.maintain_test_schema!
+
+RSpec.configure do |config|
+  # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
+  config.fixture_path = "#{::Rails.root}/spec/fixtures"
+
+  # If you're not using ActiveRecord, or you'd prefer not to run each of your
+  # examples within a transaction, remove the following line or assign false
+  # instead of true.
+  config.use_transactional_fixtures = true
+
+  # RSpec Rails can automatically mix in different behaviours to your tests
+  # based on their file location, for example enabling you to call `get` and
+  # `post` in specs under `spec/controllers`.
+  #
+  # You can disable this behaviour by removing the line below, and instead
+  # explicitly tag your specs with their type, e.g.:
+  #
+  #     RSpec.describe UsersController, type: :controller do
+  #       # ...
+  #     end
+  #
+  # The different available types are documented in the features, such as in
+  # https://relishapp.com/rspec/rspec-rails/docs
+  config.infer_spec_type_from_file_location!
+end