diff --git a/.travis.yml b/.travis.yml
index 8f17273..a281f5a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,7 +17,6 @@ gemfile:
   - gemfiles/active_record_41.gemfile
   - gemfiles/active_record_42.gemfile
   - gemfiles/active_record_edge.gemfile
-  - gemfiles/data_mapper_12.gemfile
 
 sudo: false
 
diff --git a/Rakefile b/Rakefile
index 37097b8..a7c7d56 100644
--- a/Rakefile
+++ b/Rakefile
@@ -19,7 +19,6 @@ namespace :spec do
     active_record_41
     active_record_40
     active_record_32
-    data_mapper_12
   )
 
   mappers.each do |gemfile|
diff --git a/gemfiles/data_mapper_12.gemfile b/gemfiles/data_mapper_12.gemfile
deleted file mode 100644
index 4b99a2f..0000000
--- a/gemfiles/data_mapper_12.gemfile
+++ /dev/null
@@ -1,36 +0,0 @@
-source 'https://rubygems.org'
-
-gem 'railties', '~> 3.2.21'
-gem 'dm-core', '~> 1.2.0'
-gem 'dm-migrations', '~> 1.2.0'
-gem 'dm-aggregates', '~> 1.2.0'
-gem 'dm-transactions', '~> 1.2.0'
-gem 'dm-active_model', '~> 1.2.1'
-gem 'dm-sqlite-adapter', '~> 1.2.0'
-gem 'rspec-rails', '~> 2.14.1'
-gem 'test-unit'
-
-# stick to versions that work under Ruby 1.8 for now
-gem 'capybara', '< 2.1'
-gem 'nokogiri', '< 1.6'
-gem 'rubyzip', '< 1'
-gem 'mime-types', '< 2'
-
-platforms :ruby do
-  if RUBY_VERSION > "2.1.0"
-    gem 'sqlite3'
-  else
-    gem 'sqlite3', '1.3.8'
-  end
-end
-platforms :jruby do
-  gem 'activerecord-jdbcsqlite3-adapter', '~> 1.2.0'
-end
-platforms :rbx do
-  gem 'rubysl', '~> 2.0'
-  gem 'racc'
-  gem 'rubysl-test-unit'
-  gem 'rubinius-developer_tools'
-end
-
-gemspec :path => '../'
diff --git a/lib/kaminari/hooks.rb b/lib/kaminari/hooks.rb
index 5acdac4..c7121ae 100644
--- a/lib/kaminari/hooks.rb
+++ b/lib/kaminari/hooks.rb
@@ -8,21 +8,6 @@ module Kaminari
         ::ActiveRecord::Base.send :include, Kaminari::ActiveRecordExtension
       end
 
-      # data_mapper
-      begin
-        require 'kaminari/data_mapper'
-      rescue LoadError
-        begin; require 'data_mapper'; rescue LoadError; end
-        if defined? ::DataMapper
-          ActiveSupport::Deprecation.warn 'Kaminari DataMapper support has been extracted to a separate gem, and will be removed in the next 1.0 release. Please bundle kaminari-data_mapper gem.'
-          require 'dm-aggregates'
-          require 'kaminari/models/data_mapper_extension'
-          ::DataMapper::Collection.send :include, Kaminari::DataMapperExtension::Collection
-          ::DataMapper::Model.append_extensions Kaminari::DataMapperExtension::Model
-          # ::DataMapper::Model.send :extend, Kaminari::DataMapperExtension::Model
-        end
-      end
-
       require 'kaminari/models/array_extension'
 
       ActiveSupport.on_load(:action_view) do
diff --git a/lib/kaminari/models/data_mapper_collection_methods.rb b/lib/kaminari/models/data_mapper_collection_methods.rb
deleted file mode 100644
index 8bff962..0000000
--- a/lib/kaminari/models/data_mapper_collection_methods.rb
+++ /dev/null
@@ -1,19 +0,0 @@
-module Kaminari
-  module DataMapperCollectionMethods
-    def entry_name
-      model.model_name.human.downcase
-    end
-
-    def limit_value #:nodoc:
-      query.options[:limit] || 0
-    end
-
-    def offset_value #:nodoc:
-      query.options[:offset] || 0
-    end
-
-    def total_count #:nodoc:
-      model.count(query.options.except(:limit, :offset, :order))
-    end
-  end
-end
diff --git a/lib/kaminari/models/data_mapper_extension.rb b/lib/kaminari/models/data_mapper_extension.rb
deleted file mode 100644
index 409c307..0000000
--- a/lib/kaminari/models/data_mapper_extension.rb
+++ /dev/null
@@ -1,51 +0,0 @@
-require 'kaminari/models/data_mapper_collection_methods'
-
-module Kaminari
-  module DataMapperExtension
-    module Paginatable
-      class_eval <<-RUBY, __FILE__, __LINE__ + 1
-        def #{Kaminari.config.page_method_name}(num = 1)
-          model = self
-          model = self.model if self.is_a? DataMapper::Collection
-          num = [num.to_i, 1].max - 1
-          all(:limit => model.default_per_page, :offset => model.default_per_page * num).extend Paginating
-        end
-      RUBY
-    end
-
-    module Paginating
-      include Kaminari::PageScopeMethods
-
-      def all(options={})
-        super.extend Paginating
-      end
-
-      def per(num)
-        super.extend Paginating
-      end
-    end
-
-    module Collection
-      extend ActiveSupport::Concern
-      included do
-        include Kaminari::DataMapperCollectionMethods
-        include Paginatable
-
-        delegate :default_per_page, :max_per_page, :max_pages, :to => :model
-      end
-    end
-
-    module Model
-      include Kaminari::ConfigurationMethods::ClassMethods
-      include Paginatable
-
-      def limit(val)
-        all(:limit => val)
-      end
-
-      def offset(val)
-        all(:offset => val)
-      end
-    end
-  end
-end
diff --git a/spec/fake_app/data_mapper/config.rb b/spec/fake_app/data_mapper/config.rb
deleted file mode 100644
index f81a281..0000000
--- a/spec/fake_app/data_mapper/config.rb
+++ /dev/null
@@ -1 +0,0 @@
-DataMapper.setup(:default, 'sqlite::memory:')
diff --git a/spec/fake_app/data_mapper/models.rb b/spec/fake_app/data_mapper/models.rb
deleted file mode 100644
index a4d8fdd..0000000
--- a/spec/fake_app/data_mapper/models.rb
+++ /dev/null
@@ -1,27 +0,0 @@
-class User
-  include ::DataMapper::Resource
-
-  property :id, Serial
-  property :name, String, :required => true
-  property :age, Integer
-
-  has n, :projects, :through => Resource
-end
-
-class User::Address
-  include ::DataMapper::Resource
-
-  property :id, Serial
-end
-
-class Project
-  include ::DataMapper::Resource
-
-  property :id, Serial
-  property :name, String, :required => true
-
-  has n, :users, :through => Resource
-end
-
-DataMapper.finalize
-DataMapper.auto_migrate!
diff --git a/spec/models/data_mapper/data_mapper_spec.rb b/spec/models/data_mapper/data_mapper_spec.rb
deleted file mode 100644
index 6df3486..0000000
--- a/spec/models/data_mapper/data_mapper_spec.rb
+++ /dev/null
@@ -1,205 +0,0 @@
-require 'spec_helper'
-
-if defined?(DataMapper) && !defined?(Kaminari::DataMapper)
-  # tests for issue #203
-  describe Kaminari::DataMapperCollectionMethods do
-    before do
-      30.times do |i|
-        User.create(:name => "User#{i}", :age => i)
-      end
-    end
-
-    describe 'Model' do
-      subject { User }
-      it { User.all.count.should == 30 }
-      it { User.page(1).length.should == 25 }
-      it {
-        User.paginates_per(5)
-        User.page(1).length.should == 5
-        User.all.page(1).length.should == 5
-        User.paginates_per(nil) # reset to default
-      }
-    end
-
-  end
-
-  describe Kaminari::DataMapperExtension do
-    before do
-      90.times do |i|
-        User.create(:name => "User#{i}", :age => i)
-      end
-    end
-
-    describe 'Collection' do
-      subject{ User.all }
-      it { should respond_to(:page) }
-      it { should_not respond_to(:per) }
-    end
-
-    describe 'Model' do
-      subject{ User }
-      it { should respond_to(:page) }
-      it { should respond_to(:default_per_page) }
-      it { should_not respond_to(:per) }
-    end
-
-    describe '#page' do
-      context 'page 0' do
-        subject { User.all(:age.gte => 60).page 0 }
-        it { should be_a DataMapper::Collection }
-        its(:current_page) { should == 1 }
-        its(:prev_page) { should be_nil }
-        its(:next_page) { should == 2 }
-        its('query.limit') { should == 25 }
-        its('query.offset') { should == 0 }
-        its(:total_count) { should == User.count(:age.gte => 60) }
-        its(:total_pages) { should == 2 }
-      end
-
-      context 'page 1' do
-        subject { User.all(:age.gte => 0).page 1 }
-        it { should be_a DataMapper::Collection }
-        its(:current_page) { should == 1 }
-        its(:prev_page) { should be_nil }
-        its(:next_page) { should == 2 }
-        its('query.limit') { should == 25 }
-        its('query.offset') { should == 0 }
-        its(:total_count) { should == 90 }
-        its(:total_pages) { should == 4 }
-      end
-
-      context 'page 2' do
-        subject { User.page 2 }
-        it { should be_a DataMapper::Collection }
-        its(:current_page) { should == 2 }
-        its(:prev_page) { should == 1 }
-        its(:next_page) { should == 3 }
-        its(:limit_value) { should == 25 }
-        its('query.limit') { should == 25 }
-        its('query.offset') { should == 25 }
-        its(:total_count) { should == 90 }
-        its(:total_pages) { should == 4 }
-      end
-
-      context 'page "foobar"' do
-        subject { User.page 'foobar' }
-        it { should be_a DataMapper::Collection }
-        its(:current_page) { should == 1 }
-        its(:prev_page) { should be_nil }
-        its(:next_page) { should == 2 }
-        its('query.limit') { should == 25 }
-        its('query.offset') { should == 0 }
-        its(:total_count) { should == 90 }
-        its(:total_pages) { should == 4 }
-      end
-
-      context 'with criteria before' do
-        subject { User.all(:age.gt => 60).page 2 }
-        it { should be_a DataMapper::Collection }
-        its(:current_page) { should == 2 }
-        its(:prev_page) { should == 1 }
-        its(:next_page) { should be_nil }
-        its('query.limit') { should == 25 }
-        its('query.offset') { should == 25 }
-        its(:total_count) { should == User.count(:age.gt => 60) }
-        its(:total_pages) { should == 2 }
-      end
-
-      context 'with criteria after' do
-        subject { User.page(2).all(:age.gt => 60) }
-        it { should be_a DataMapper::Collection }
-        its(:current_page) { should == 2 }
-        its(:prev_page) { should == 1 }
-        its(:next_page) { should be_nil }
-        its('query.limit') { should == 25 }
-        its('query.offset') { should == 25 }
-        its(:total_count) { should == User.count(:age.gt => 60) }
-        its(:total_pages) { should == 2 }
-      end
-    end
-
-    describe '#per' do
-      context 'on simple query' do
-        subject { User.page(2).per(20) }
-        it { should be_a DataMapper::Collection }
-        its(:current_page) { should == 2 }
-        its(:prev_page) { should == 1 }
-        its(:next_page) { should == 3 }
-        its('query.limit') { should == 20 }
-        its(:limit_value) { should == 20 }
-        its('query.offset') { should == 20 }
-        its(:total_count) { should == 90 }
-        its(:total_pages) { should == 5 }
-      end
-
-      context 'on query with condition' do
-        subject { User.page(5).all(:age.lte => 80).per(13) }
-        its(:current_page) { should == 5 }
-        its(:prev_page) { should == 4 }
-        its(:next_page) { should == 6 }
-        its('query.limit') { should == 13 }
-        its('query.offset') { should == 52 }
-        its(:total_count) { should == 81 }
-        its(:total_pages) { should == 7 }
-      end
-
-      context 'on query with order' do
-        subject { User.page(5).all(:age.lte => 80, :order => [:age.asc]).per(13) }
-        it('includes user with age 52') { should include(User.first(:age => 52)) }
-        it('does not include user with age 51') { should_not include(User.first(:age => 51)) }
-        it('includes user with age 52') { should include(User.first(:age => 64)) }
-        it('does not include user with age 51') { should_not include(User.first(:age => 65)) }
-        its(:current_page) { should == 5 }
-        its(:prev_page) { should == 4 }
-        its(:next_page) { should == 6 }
-        its('query.limit') { should == 13 }
-        its('query.offset') { should == 52 }
-        its(:total_count) { should == 81 }
-        its(:total_pages) { should == 7 }
-      end
-
-      context 'on chained queries' do
-        subject { User.all(:age.gte => 50).page(3).all(:age.lte => 80).per(13) }
-        its(:current_page) { should == 3 }
-        its(:prev_page) { should == 2 }
-        its(:next_page) { should be_nil }
-        its('query.limit') { should == 13 }
-        its('query.offset') { should == 26 }
-        its(:total_count) { should == 31 }
-        its(:total_pages) { should == 3 }
-      end
-
-      context 'for association' do
-        before do
-          worker0 = User[0]
-          30.times do |i|
-            worker0.projects << Project.create(:name => "Project#{i}")
-          end
-          worker0.projects.save
-        end
-
-        context 'on query' do
-          subject { User[0].projects.page(3).all(:name.like => 'Project%').per(5) }
-          its(:current_page) { should == 3 }
-          its(:prev_page) { should == 2 }
-          its(:next_page) { should == 4 }
-          its('query.limit') { should == 5 }
-          its('query.offset') { should == 10 }
-          its(:total_count) { should == 30 }
-          its(:total_pages) { should == 6 }
-        end
-
-        context 'after association conditions' do
-          subject { User.page(3).all(:projects => Project.all).per(5) }
-          its(:current_page) { should == 3 }
-          its(:prev_page) { should == 2 }
-          its(:next_page) { should == 4 }
-          its('query.limit') { should == 5 }
-          its('query.offset') { should == 10 }
-          its(:total_count) { should == 30 }
-          its(:total_pages) { should == 6 }
-        end
-      end
-    end
-  end
-end
diff --git a/spec/support/database_cleaner.rb b/spec/support/database_cleaner.rb
index c33a71d..e87cd72 100644
--- a/spec/support/database_cleaner.rb
+++ b/spec/support/database_cleaner.rb
@@ -1,10 +1,8 @@
 DatabaseCleaner[:active_record].strategy = :transaction if defined? ActiveRecord
-DatabaseCleaner[:data_mapper].strategy = :truncation if defined? DataMapper
 
 RSpec.configure do |config|
   config.before :suite do
     DatabaseCleaner.clean_with :truncation if defined? ActiveRecord
-    DatabaseCleaner.clean_with :truncation if defined? DataMapper
   end
   config.before :each do
     DatabaseCleaner.start