diff --git a/Appraisals b/Appraisals
index 55f6d2f..44a7190 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,27 +1,11 @@
-appraise "rails_3_0" do
-  gem "rails", "~> 3.0.0"
+appraise "rails_4_0" do
+  gem "rails", "~> 4.0.0"
 end
 
-appraise "rails_3_1" do
-  gem "rails", "~> 3.1.0"
+appraise "rails_4_1" do
+  gem "rails", "~> 4.1.0"
 end
 
-appraise "rails_3_2" do
-  gem "rails", "~> 3.2.0"
-end
-
-appraise "mongoid_2_1" do
-  gem "mongoid", "~> 2.1.0"
-end
-
-appraise "mongoid_2_2" do
-  gem "mongoid", "~> 2.2.0"
-end
-
-appraise "mongoid_2_3" do
-  gem "mongoid", "~> 2.3.0"
-end
-
-appraise "mongoid_2_4" do
-  gem "mongoid", "~> 2.4.0"
-end
+appraise "rails_4_2" do
+  gem "rails", "~> 4.2.0"
+end
\ No newline at end of file
diff --git a/Gemfile b/Gemfile
index 9ab5fe8..76e48a4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,23 +2,17 @@ source 'http://rubygems.org'
 
 gemspec
 
-gem 'rails', '~> 3.2.6'
+gem 'rails', '~> 4.0.0'
 gem 'rspec', '~> 2.8'
 gem 'rspec-rails', '~> 2.8'
 gem 'timecop'
 gem 'rspec_tag_matchers'
-gem 'ruby-debug', :platforms => [:ruby_18, :jruby]
-gem 'byebug', :platforms => [:ruby_19, :ruby_20, :ruby_21, :ruby_22]
+gem 'ruby-debug', :platforms => [:jruby]
+gem 'byebug', :platforms => [:ruby_20, :ruby_21, :ruby_22]
 gem 'appraisal'
 gem 'sqlite3'
 gem 'nokogiri', '1.6.6.2'
 
-group :mongoid do
-  gem 'mongoid', '>= 3.0'
-  gem 'bson_ext'
-  gem 'system_timer', :platforms => [:ruby_18]
-end
-
 group :active_record do
   gem 'sqlite3-ruby', :require => 'sqlite3'
 end
diff --git a/README.rdoc b/README.rdoc
index fa83d03..6665dc5 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -137,8 +137,8 @@ like so
 
   ValidatesTimeliness.setup do |config|
 
-    # Extend ORM/ODMs for full support (:active_record, :mongoid).
-    config.extend_orms = [ :mongoid ]
+    # Extend ORM/ODMs for full support (:active_record).
+    config.extend_orms = [ :active_record ]
 
   end
 
diff --git a/gemfiles/mongoid_2_1.gemfile b/gemfiles/mongoid_2_1.gemfile
deleted file mode 100644
index 0eaaeae..0000000
--- a/gemfiles/mongoid_2_1.gemfile
+++ /dev/null
@@ -1,16 +0,0 @@
-# This file was generated by Appraisal
-
-source "http://rubygems.org"
-
-gem "rails", "~> 3.2.6"
-gem "rspec", "~> 2.8"
-gem "rspec-rails", "~> 2.8"
-gem "timecop"
-gem "rspec_tag_matchers"
-gem "ruby-debug", :platforms=>[:ruby_18, :jruby]
-gem "debugger", :platforms=>[:ruby_19]
-gem "appraisal"
-gem "sqlite3"
-gem "mongoid", "~> 2.1.0"
-
-gemspec :path=>"../"
\ No newline at end of file
diff --git a/gemfiles/mongoid_2_2.gemfile b/gemfiles/mongoid_2_2.gemfile
deleted file mode 100644
index 5f2779d..0000000
--- a/gemfiles/mongoid_2_2.gemfile
+++ /dev/null
@@ -1,16 +0,0 @@
-# This file was generated by Appraisal
-
-source "http://rubygems.org"
-
-gem "rails", "~> 3.2.6"
-gem "rspec", "~> 2.8"
-gem "rspec-rails", "~> 2.8"
-gem "timecop"
-gem "rspec_tag_matchers"
-gem "ruby-debug", :platforms=>[:ruby_18, :jruby]
-gem "debugger", :platforms=>[:ruby_19]
-gem "appraisal"
-gem "sqlite3"
-gem "mongoid", "~> 2.2.0"
-
-gemspec :path=>"../"
\ No newline at end of file
diff --git a/gemfiles/mongoid_2_3.gemfile b/gemfiles/mongoid_2_3.gemfile
deleted file mode 100644
index 1782e98..0000000
--- a/gemfiles/mongoid_2_3.gemfile
+++ /dev/null
@@ -1,16 +0,0 @@
-# This file was generated by Appraisal
-
-source "http://rubygems.org"
-
-gem "rails", "~> 3.2.6"
-gem "rspec", "~> 2.8"
-gem "rspec-rails", "~> 2.8"
-gem "timecop"
-gem "rspec_tag_matchers"
-gem "ruby-debug", :platforms=>[:ruby_18, :jruby]
-gem "debugger", :platforms=>[:ruby_19]
-gem "appraisal"
-gem "sqlite3"
-gem "mongoid", "~> 2.3.0"
-
-gemspec :path=>"../"
\ No newline at end of file
diff --git a/gemfiles/mongoid_2_4.gemfile b/gemfiles/mongoid_2_4.gemfile
deleted file mode 100644
index 4bf8ba6..0000000
--- a/gemfiles/mongoid_2_4.gemfile
+++ /dev/null
@@ -1,16 +0,0 @@
-# This file was generated by Appraisal
-
-source "http://rubygems.org"
-
-gem "rails", "~> 3.2.6"
-gem "rspec", "~> 2.8"
-gem "rspec-rails", "~> 2.8"
-gem "timecop"
-gem "rspec_tag_matchers"
-gem "ruby-debug", :platforms=>[:ruby_18, :jruby]
-gem "debugger", :platforms=>[:ruby_19]
-gem "appraisal"
-gem "sqlite3"
-gem "mongoid", "~> 2.4.0"
-
-gemspec :path=>"../"
\ No newline at end of file
diff --git a/lib/generators/validates_timeliness/templates/validates_timeliness.rb b/lib/generators/validates_timeliness/templates/validates_timeliness.rb
index 6173c45..23c1cd3 100644
--- a/lib/generators/validates_timeliness/templates/validates_timeliness.rb
+++ b/lib/generators/validates_timeliness/templates/validates_timeliness.rb
@@ -1,5 +1,5 @@
 ValidatesTimeliness.setup do |config|
-  # Extend ORM/ODMs for full support (:active_record, :mongoid).
+  # Extend ORM/ODMs for full support (:active_record).
   # config.extend_orms = [ :active_record ]
   #
   # Default timezone
diff --git a/lib/validates_timeliness.rb b/lib/validates_timeliness.rb
index fbb9a14..79abf31 100644
--- a/lib/validates_timeliness.rb
+++ b/lib/validates_timeliness.rb
@@ -28,7 +28,7 @@ module ValidatesTimeliness
     attr_accessor :extend_orms, :ignore_restriction_errors, :restriction_shorthand_symbols, :use_plugin_parser
   end
 
-  # Extend ORM/ODMs for full support (:active_record, :mongoid).
+  # Extend ORM/ODMs for full support (:active_record).
   self.extend_orms = []
 
   # Ignore errors when restriction options are evaluated
diff --git a/lib/validates_timeliness/orm/mongoid.rb b/lib/validates_timeliness/orm/mongoid.rb
deleted file mode 100644
index f72fdd3..0000000
--- a/lib/validates_timeliness/orm/mongoid.rb
+++ /dev/null
@@ -1,49 +0,0 @@
-module ValidatesTimeliness
-  module ORM
-    module Mongoid
-      extend ActiveSupport::Concern
-      # You need define the fields before you define the validations.
-      # It is best to use the plugin parser to avoid errors on a bad
-      # field value in Mongoid. Parser will return nil rather than error.
-
-      module ClassMethods
-        public
-
-        # Mongoid has no bulk attribute method definition hook. It defines
-        # them with each field definition. So we likewise define them after
-        # each validation is defined.
-        #
-        def timeliness_validation_for(attr_names, type)
-          super
-          attr_names.each { |attr_name| define_timeliness_write_method(attr_name) }
-        end
-
-        def timeliness_attribute_type(attr_name)
-          {
-            Date => :date,
-            Time => :time,
-            DateTime => :datetime
-          }[fields[database_field_name(attr_name)].type] || :datetime
-        end
-
-        protected
-
-        def timeliness_type_cast_code(attr_name, var_name)
-          type = timeliness_attribute_type(attr_name)
-
-          "#{var_name} = Timeliness::Parser.parse(value, :#{type})"
-        end
-      end
-
-      def reload(*args)
-        _clear_timeliness_cache
-        super
-      end
-    end
-  end
-end
-
-module Mongoid::Document
-  include ValidatesTimeliness::AttributeMethods
-  include ValidatesTimeliness::ORM::Mongoid
-end
diff --git a/spec/validates_timeliness/orm/mongoid_spec.rb b/spec/validates_timeliness/orm/mongoid_spec.rb
deleted file mode 100644
index 7c466a5..0000000
--- a/spec/validates_timeliness/orm/mongoid_spec.rb
+++ /dev/null
@@ -1,223 +0,0 @@
-require 'spec_helper'
-
-# Try loading mongoid and connecting. Otherwise, abort and skip spec.
-begin
-
-require 'mongoid'
-require 'validates_timeliness/orm/mongoid'
-
-Mongoid.configure do |config|
-  config.connect_to('validates_timeliness_test')
-end
-
-describe ValidatesTimeliness, 'Mongoid' do
-  after(:each) do
-    Mongoid.purge!
-  end
-
-  class Article
-    include Mongoid::Document
-    field :publish_date, :type => Date
-    field :publish_time, :type => Time
-    field :publish_datetime, :type => DateTime
-    validates_date :publish_date, :allow_nil => true
-    validates_time :publish_time, :allow_nil => true
-    validates_datetime :publish_datetime, :allow_nil => true
-  end
-
-  context "validation methods" do
-    let(:record) { Article.new }
-
-    it 'should be defined on the class' do
-      Article.should respond_to(:validates_date)
-      Article.should respond_to(:validates_time)
-      Article.should respond_to(:validates_datetime)
-    end
-
-    it 'should be defined on the instance' do
-      record.should respond_to(:validates_date)
-      record.should respond_to(:validates_time)
-      record.should respond_to(:validates_datetime)
-    end
-
-    it "should validate a valid value string" do
-      record.publish_date = '2012-01-01'
-
-      record.valid?
-      record.errors[:publish_date].should be_empty
-    end
-
-    it "should validate a nil value" do
-      record.publish_date = nil
-
-      record.valid?
-      record.errors[:publish_date].should be_empty
-    end
-  end
-
-  it 'should determine type for attribute' do
-    Article.timeliness_attribute_type(:publish_date).should == :date
-    Article.timeliness_attribute_type(:publish_time).should == :time
-    Article.timeliness_attribute_type(:publish_datetime).should == :datetime
-  end
-  
-  context "attribute write method" do
-    let(:record) { Article.new }
-
-    it 'should cache attribute raw value' do
-      record.publish_datetime = date_string = '2010-01-01'
-
-      record._timeliness_raw_value_for('publish_datetime').should == date_string
-    end
-
-    context "with plugin parser" do
-      let(:record) { ArticleWithParser.new }
-
-      class ArticleWithParser
-        include Mongoid::Document
-        field :publish_date, :type => Date
-        field :publish_time, :type => Time
-        field :publish_datetime, :type => DateTime
-
-        ValidatesTimeliness.use_plugin_parser = true
-        validates_date :publish_date, :allow_nil => true
-        validates_time :publish_time, :allow_nil => true
-        validates_datetime :publish_datetime, :allow_nil => true
-        ValidatesTimeliness.use_plugin_parser = false
-      end
-
-      context "for a date column" do
-        it 'should parse a string value' do
-          Timeliness::Parser.should_receive(:parse)
-
-          record.publish_date = '2010-01-01'
-        end
-
-        it 'should parse a invalid string value as nil' do
-          Timeliness::Parser.should_receive(:parse)
-
-          record.publish_date = 'not valid'
-        end
-
-        it 'should store a Date value after parsing string' do
-          record.publish_date = '2010-01-01'
-
-          record.publish_date.should be_kind_of(Date)
-          record.publish_date.should eq Date.new(2010, 1, 1)
-        end
-      end
-
-      context "for a time column" do
-        it 'should parse a string value' do
-          Timeliness::Parser.should_receive(:parse)
-
-          record.publish_time = '12:30'
-        end
-
-        it 'should parse a invalid string value as nil' do
-          Timeliness::Parser.should_receive(:parse)
-
-          record.publish_time = 'not valid'
-        end
-
-        it 'should store a Time value after parsing string' do
-          record.publish_time = '12:30'
-
-          record.publish_time.should be_kind_of(Time)
-          record.publish_time.should eq Time.utc(2000, 1, 1, 12, 30)
-        end
-      end
-
-      context "for a datetime column" do
-        with_config(:default_timezone, 'Australia/Melbourne')
-
-        it 'should parse a string value' do
-          Timeliness::Parser.should_receive(:parse)
-
-          record.publish_datetime = '2010-01-01 12:00'
-        end
-
-        it 'should parse a invalid string value as nil' do
-          Timeliness::Parser.should_receive(:parse)
-
-          record.publish_datetime = 'not valid'
-        end
-
-        it 'should parse string into DateTime value' do
-          record.publish_datetime = '2010-01-01 12:00'
-
-          record.publish_datetime.should be_kind_of(DateTime)
-        end
-
-        it 'should parse string as current timezone' do
-          record.publish_datetime = '2010-06-01 12:00'
-
-          record.publish_datetime.utc_offset.should eq Time.zone.utc_offset
-        end
-      end
-    end
-  end
-
-  context "cached value" do
-    it 'should be cleared on reload' do
-      record = Article.create!
-      record.publish_date = '2010-01-01'
-      record.reload
-      record._timeliness_raw_value_for('publish_date').should be_nil
-    end
-  end
-
-  context "before_type_cast method" do
-    let(:record){ Article.new }
-
-    it 'should be defined on class if ORM supports it' do
-      record.should respond_to(:publish_datetime_before_type_cast)
-    end
-
-    it 'should return original value' do
-      record.publish_datetime = date_string = '2010-01-01'
-
-      record.publish_datetime_before_type_cast.should eq date_string
-    end
-
-    it 'should return attribute if no attribute assignment has been made' do
-      time = Time.zone.local(2010,01,01)
-      Article.create(:publish_datetime => time)
-      record = Article.last
-      record.publish_datetime_before_type_cast.should eq time.to_datetime
-    end
-
-    context "with plugin parser" do
-      with_config(:use_plugin_parser, true)
-
-      it 'should return original value' do
-        record.publish_datetime = date_string = '2010-01-31'
-        record.publish_datetime_before_type_cast.should eq date_string
-      end
-    end
-  end
-
-  context "with aliased fields" do
-    class ArticleWithAliasedFields
-      include Mongoid::Document
-      field :pd, as: :publish_date, :type => Date
-      field :pt, as: :publish_time, :type => Time
-      field :pdt, as: :publish_datetime, :type => DateTime
-      validates_date :publish_date, :allow_nil => true
-      validates_time :publish_time, :allow_nil => true
-      validates_datetime :publish_datetime, :allow_nil => true
-    end
-
-    it 'should determine type for attribute' do
-      ArticleWithAliasedFields.timeliness_attribute_type(:publish_date).should == :date
-      ArticleWithAliasedFields.timeliness_attribute_type(:publish_time).should == :time
-      ArticleWithAliasedFields.timeliness_attribute_type(:publish_datetime).should == :datetime
-    end
-  end
-end
-
-rescue LoadError
-  puts "Mongoid specs skipped. Mongoid not installed"
-rescue StandardError => e
-  puts "Mongoid specs skipped. MongoDB connection failed with error: #{e.message}"
-end