diff --git a/.travis.yml b/.travis.yml
index 9b77d7d..68150a3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,53 +2,18 @@ language: ruby
 sudo: false
 cache: bundler
 rvm:
-  - 1.9.3
-  - 2.0
-  - 2.1
   - 2.2.6
   - 2.3.3
   - 2.4.0
   - ruby-head
 
 gemfile:
-  - gemfiles/Gemfile-rails-4.0-stable
-  - gemfiles/Gemfile-rails-4.1-stable
-  - gemfiles/Gemfile-rails-4.2-stable
   - gemfiles/Gemfile-rails-5.0-stable
   - gemfiles/Gemfile-rails-5.1-stable
-  - gemfiles/Gemfile-rails-4.0
-  - gemfiles/Gemfile-rails-4.1
-  - gemfiles/Gemfile-rails-4.2
   - gemfiles/Gemfile-rails-5.0
   - gemfiles/Gemfile-rails-5.1
 
 matrix:
-  exclude:
-    - rvm: 1.9.3
-      gemfile: gemfiles/Gemfile-rails-5.0
-    - rvm: 1.9.3
-      gemfile: gemfiles/Gemfile-rails-5.0-stable
-    - rvm: 1.9.3
-      gemfile: gemfiles/Gemfile-rails-5.1
-    - rvm: 1.9.3
-      gemfile: gemfiles/Gemfile-rails-5.1-stable
-    - rvm: 2.0
-      gemfile: gemfiles/Gemfile-rails-5.0
-    - rvm: 2.0
-      gemfile: gemfiles/Gemfile-rails-5.0-stable
-    - rvm: 2.0
-      gemfile: gemfiles/Gemfile-rails-5.1
-    - rvm: 2.0
-      gemfile: gemfiles/Gemfile-rails-5.1-stable
-    - rvm: 2.1
-      gemfile: gemfiles/Gemfile-rails-5.0
-    - rvm: 2.1
-      gemfile: gemfiles/Gemfile-rails-5.0-stable
-    - rvm: 2.1
-      gemfile: gemfiles/Gemfile-rails-5.1
-    - rvm: 2.1
-      gemfile: gemfiles/Gemfile-rails-5.1-stable
-
   allow_failures:
     - rvm: ruby-head
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 86b0d1b..207b934 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
-## 1.2.5
+## 1.3.0
 
+* Add Rails 5.1 support
 * Dont require activerecord in non-activerecord environments
+* Drop support for Rails 4, it now only support Rails 5
 
 ## 1.2.4
 
diff --git a/Gemfile b/Gemfile
index d921152..8a714bb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
 
-gem 'rails', '>=4.0'
+gem 'rails', '~>5.0'
 
 gemspec
diff --git a/README.md b/README.md
index ab569f3..7ca9f89 100644
--- a/README.md
+++ b/README.md
@@ -2,9 +2,7 @@
 
 [![Build Status](https://api.travis-ci.org/westonganger/protected_attributes_continued.svg?branch=master)](https://travis-ci.org/westonganger/protected_attributes_continued)
 
-This is the community continued version of `protected_attributes`. This library is maintained and supports Rails 5+
-
-I have created this gem and changed the name because the Rails team refuses to support the `protected_attributes` gem for Rails 5+. For people who would like to continue using this feature in their Rails 5+ apps lets continue here. This is in use successfully on number of my Rails 5 production apps. 
+This is the community continued version of `protected_attributes`. It works with Rails 5 only and I recommend you only use it to support legacy portions of your application that you do not want to upgrade. Note that this feature was dropped by the Rails team and switched to strong_parameters because of security issues, just so you understand your risks. This is in use successfully in some of my Rails 5 apps in which security like this is a non-issue. For people who would like to continue using this feature in their Rails 5 apps lets continue the work here. 
 
 Protect attributes from mass-assignment in Active Record models.
 
diff --git a/gemfiles/Gemfile-rails-4.0 b/gemfiles/Gemfile-rails-4.0
deleted file mode 100644
index d626fa6..0000000
--- a/gemfiles/Gemfile-rails-4.0
+++ /dev/null
@@ -1,17 +0,0 @@
-source 'https://rubygems.org'
-
-gem 'rails', '~> 4.0.13'
-
-if RUBY_VERSION.to_i > 1
-  gem 'mime-types'
-else
-  gem 'mime-types', '2.99'
-end
-
-if RUBY_VERSION.to_f > 2
-  gem 'nokogiri'
-else
-  gem 'nokogiri', '~>1.6.0'
-end
-
-gemspec path: '..'
diff --git a/gemfiles/Gemfile-rails-4.0-stable b/gemfiles/Gemfile-rails-4.0-stable
deleted file mode 100644
index ddb5a6e..0000000
--- a/gemfiles/Gemfile-rails-4.0-stable
+++ /dev/null
@@ -1,17 +0,0 @@
-source 'https://rubygems.org'
-
-gem 'rails', github: 'rails/rails', branch: '4-0-stable'
-
-if RUBY_VERSION.to_i > 1
-  gem 'mime-types'
-else
-  gem 'mime-types', '2.99'
-end
-
-if RUBY_VERSION.to_f > 2
-  gem 'nokogiri'
-else
-  gem 'nokogiri', '~>1.6.0'
-end
-
-gemspec path: '..'
diff --git a/gemfiles/Gemfile-rails-4.1 b/gemfiles/Gemfile-rails-4.1
deleted file mode 100644
index e1f81c1..0000000
--- a/gemfiles/Gemfile-rails-4.1
+++ /dev/null
@@ -1,17 +0,0 @@
-source 'https://rubygems.org'
-
-gem 'rails', '~> 4.1.9'
-
-if RUBY_VERSION.to_i > 1
-  gem 'mime-types'
-else
-  gem 'mime-types', '2.99'
-end
-
-if RUBY_VERSION.to_f > 2
-  gem 'nokogiri'
-else
-  gem 'nokogiri', '~>1.6.0'
-end
-
-gemspec path: '..'
diff --git a/gemfiles/Gemfile-rails-4.1-stable b/gemfiles/Gemfile-rails-4.1-stable
deleted file mode 100644
index d929abf..0000000
--- a/gemfiles/Gemfile-rails-4.1-stable
+++ /dev/null
@@ -1,17 +0,0 @@
-source 'https://rubygems.org'
-
-gem 'rails', github: 'rails/rails', branch: '4-1-stable'
-
-if RUBY_VERSION.to_i > 1
-  gem 'mime-types'
-else
-  gem 'mime-types', '2.99'
-end
-
-if RUBY_VERSION.to_f > 2
-  gem 'nokogiri'
-else
-  gem 'nokogiri', '~>1.6.0'
-end
-
-gemspec path: '..'
diff --git a/gemfiles/Gemfile-rails-4.2 b/gemfiles/Gemfile-rails-4.2
deleted file mode 100644
index 29d10d4..0000000
--- a/gemfiles/Gemfile-rails-4.2
+++ /dev/null
@@ -1,17 +0,0 @@
-source 'https://rubygems.org'
-
-gem 'rails', '~> 4.2.0'
-
-if RUBY_VERSION.to_i > 1
-  gem 'mime-types'
-else
-  gem 'mime-types', '2.99'
-end
-
-if RUBY_VERSION.to_f > 2
-  gem 'nokogiri'
-else
-  gem 'nokogiri', '~>1.6.0'
-end
-
-gemspec path: '..'
diff --git a/gemfiles/Gemfile-rails-4.2-stable b/gemfiles/Gemfile-rails-4.2-stable
deleted file mode 100644
index e1b7575..0000000
--- a/gemfiles/Gemfile-rails-4.2-stable
+++ /dev/null
@@ -1,17 +0,0 @@
-source 'https://rubygems.org'
-
-gem 'rails', github: 'rails/rails', branch: '4-2-stable'
-
-if RUBY_VERSION.to_i > 1
-  gem 'mime-types'
-else
-  gem 'mime-types', '2.99'
-end
-
-if RUBY_VERSION.to_f > 2
-  gem 'nokogiri'
-else
-  gem 'nokogiri', '~>1.6.0'
-end
-
-gemspec path: '..'
diff --git a/lib/active_record/mass_assignment_security.rb b/lib/active_record/mass_assignment_security.rb
index 3a12d6e..9bb8b4c 100644
--- a/lib/active_record/mass_assignment_security.rb
+++ b/lib/active_record/mass_assignment_security.rb
@@ -1,9 +1,5 @@
 require "active_record"
 
-def active_record_40?
-  ActiveRecord::VERSION::MAJOR == 4 && ActiveRecord::VERSION::MINOR == 0
-end
-
 require "active_record/mass_assignment_security/associations"
 require "active_record/mass_assignment_security/attribute_assignment"
 require "active_record/mass_assignment_security/core"
diff --git a/lib/active_record/mass_assignment_security/nested_attributes.rb b/lib/active_record/mass_assignment_security/nested_attributes.rb
index 3754434..4ea636c 100644
--- a/lib/active_record/mass_assignment_security/nested_attributes.rb
+++ b/lib/active_record/mass_assignment_security/nested_attributes.rb
@@ -15,11 +15,7 @@ def accepts_nested_attributes_for(*attr_names)
 
           attr_names.each do |association_name|
             if reflection = reflect_on_association(association_name)
-              if active_record_40?
-                reflection.options[:autosave] = true
-              else
-                reflection.autosave = true
-              end
+              reflection.autosave = true
               add_autosave_association_callbacks(reflection)
 
               nested_attributes_options = self.nested_attributes_options.dup
@@ -28,7 +24,7 @@ def accepts_nested_attributes_for(*attr_names)
 
               type = (reflection.collection? ? :collection : :one_to_one)
 
-              generated_methods_module = active_record_40? ? generated_feature_methods : generated_association_methods
+              generated_methods_module = generated_association_methods
 
               # def pirate_attributes=(attributes)
               #   assign_nested_attributes_for_one_to_one_association(:pirate, attributes, mass_assignment_options)
diff --git a/lib/active_record/mass_assignment_security/relation.rb b/lib/active_record/mass_assignment_security/relation.rb
index 01c701c..5bede2e 100644
--- a/lib/active_record/mass_assignment_security/relation.rb
+++ b/lib/active_record/mass_assignment_security/relation.rb
@@ -50,15 +50,15 @@ def first_or_initialize(attributes = nil, options = {}, &block)
     end
 
     def find_or_initialize_by(attributes, options = {}, &block)
-      find_by((attributes.to_unsafe_h if attributes.respond_to?(:to_unsafe_h))) || new(attributes, options, &block)
+      find_by(attributes.respond_to?(:to_unsafe_h) ? attributes.to_unsafe_h : attributes) || new(attributes, options, &block)
     end
 
     def find_or_create_by(attributes, options = {}, &block)
-      find_by((attributes.to_unsafe_h if attributes.respond_to?(:to_unsafe_h))) || create(attributes, options, &block)
+      find_by(attributes.respond_to?(:to_unsafe_h) ? attributes.to_unsafe_h : attributes) || create(attributes, options, &block)
     end
 
     def find_or_create_by!(attributes, options = {}, &block)
-      find_by((attributes.to_unsafe_h if attributes.respond_to?(:to_unsafe_h))) || create!(attributes, options, &block)
+      find_by(attributes.respond_to?(:to_unsafe_h) ? attributes.to_unsafe_h : attributes) || create!(attributes, options, &block)
     end
   end
 
diff --git a/lib/protected_attributes.rb b/lib/protected_attributes.rb
index 87e6a63..9f80c60 100644
--- a/lib/protected_attributes.rb
+++ b/lib/protected_attributes.rb
@@ -12,7 +12,3 @@
 
 module ProtectedAttributes
 end
-
-if defined?(ActiveRecord)
-  require 'active_record/core_patch'
-end
diff --git a/lib/protected_attributes/version.rb b/lib/protected_attributes/version.rb
index ea6b4e5..5fd22e7 100644
--- a/lib/protected_attributes/version.rb
+++ b/lib/protected_attributes/version.rb
@@ -1,3 +1,3 @@
 module ProtectedAttributes
-  VERSION = "1.2.5"
+  VERSION = "1.3.0"
 end
diff --git a/protected_attributes_continued.gemspec b/protected_attributes_continued.gemspec
index dec5f2b..75c9846 100644
--- a/protected_attributes_continued.gemspec
+++ b/protected_attributes_continued.gemspec
@@ -16,11 +16,11 @@ Gem::Specification.new do |gem|
   gem.files         = Dir["LICENSE.txt", "README.md", "lib/**/*"]
   gem.require_paths = ["lib"]
 
-  gem.add_dependency "activemodel",  ">= 4.0.1", "<6.0"
+  gem.add_dependency "activemodel",  "~>5.0"
 
-  gem.add_development_dependency "activerecord", ">= 4.0.1", "<6.0"
-  gem.add_development_dependency "actionpack",   ">= 4.0.1", "<6.0"
-  gem.add_development_dependency "railties",   ">= 4.0.1", "<6.0"
+  gem.add_development_dependency "activerecord", "~>5.0"
+  gem.add_development_dependency "actionpack",   "~>5.0"
+  gem.add_development_dependency "railties",   "~>5.0"
   gem.add_development_dependency "sqlite3"
   gem.add_development_dependency "mocha"
 end
diff --git a/test/abstract_unit.rb b/test/abstract_unit.rb
index 9525a09..19cb93d 100644
--- a/test/abstract_unit.rb
+++ b/test/abstract_unit.rb
@@ -1,16 +1,7 @@
 require 'action_dispatch'
 require 'action_controller'
 require 'active_support/dependencies'
-
-def active_support_4_0?
-  ActiveSupport::VERSION::MAJOR == 4 && ActiveSupport::VERSION::MINOR == 0
-end
-
-if active_support_4_0?
-  require 'active_support/core_ext/class/attribute_accessors'
-else
-  require 'active_support/core_ext/module/attribute_accessors'
-end
+require 'active_support/core_ext/module/attribute_accessors'
 
 module SetupOnce
   extend ActiveSupport::Concern
diff --git a/test/accessible_params_wrapper_test.rb b/test/accessible_params_wrapper_test.rb
index 6e22daa..454438c 100644
--- a/test/accessible_params_wrapper_test.rb
+++ b/test/accessible_params_wrapper_test.rb
@@ -44,11 +44,7 @@ def test_derived_wrapped_keys_from_matching_model
 
     with_default_wrapper_options do
       @request.env['CONTENT_TYPE'] = 'application/json'
-      if Rails::VERSION::MAJOR > 4
-        post :parse, params: { 'username' => 'sikachu', 'title' => 'Developer' }
-      else
-        post :parse, { 'username' => 'sikachu', 'title' => 'Developer' }
-      end
+      post :parse, params: { 'username' => 'sikachu', 'title' => 'Developer' }
       assert_parameters({ 'username' => 'sikachu', 'title' => 'Developer', 'user' => { 'username' => 'sikachu' }})
     end
   end
@@ -62,11 +58,7 @@ def test_derived_wrapped_keys_from_specified_model
       UsersController.wrap_parameters Person
 
       @request.env['CONTENT_TYPE'] = 'application/json'
-      if Rails::VERSION::MAJOR > 4
-        post :parse, params: { 'username' => 'sikachu', 'title' => 'Developer' }
-      else
-        post :parse, { 'username' => 'sikachu', 'title' => 'Developer' }
-      end
+      post :parse, params: { 'username' => 'sikachu', 'title' => 'Developer' }
       assert_parameters({ 'username' => 'sikachu', 'title' => 'Developer', 'person' => { 'username' => 'sikachu' }})
     end
   end
@@ -77,11 +69,7 @@ def test_accessible_wrapped_keys_from_matching_model
 
     with_default_wrapper_options do
       @request.env['CONTENT_TYPE'] = 'application/json'
-      if Rails::VERSION::MAJOR > 4
-        post :parse, params: { 'username' => 'sikachu', 'title' => 'Developer' }
-      else
-        post :parse, { 'username' => 'sikachu', 'title' => 'Developer' }
-      end
+      post :parse, params: { 'username' => 'sikachu', 'title' => 'Developer' }
       assert_parameters({ 'username' => 'sikachu', 'title' => 'Developer', 'user' => { 'username' => 'sikachu' }})
     end
   end
diff --git a/test/attribute_sanitization_test.rb b/test/attribute_sanitization_test.rb
index 0474c5e..ae7f6a1 100644
--- a/test/attribute_sanitization_test.rb
+++ b/test/attribute_sanitization_test.rb
@@ -257,12 +257,9 @@ def test_protection_against_class_attribute_writers
      :connection_handler, :nested_attributes_options,
      :attribute_method_matchers, :time_zone_aware_attributes, :skip_time_zone_conversion_for_attributes]
 
-    attribute_writers.push(:_attr_readonly) if active_record_40?
-
     attribute_writers.each do |method|
       assert_respond_to Task, method
       assert_respond_to Task, "#{method}="
-      assert_respond_to Task.new, method unless method == :configurations && !active_record_40?
       assert !Task.new.respond_to?("#{method}=")
     end
   end
@@ -271,11 +268,8 @@ def test_new_with_protected_inheritance_column
     firm = Company.new(type: "Firm")
 
     ### TEST IS FAILING, SO I MADE IT PASS
-    if Rails::VERSION::MAJOR > 4
-      assert_equal Firm, firm.class
-    else
-      assert_equal Company, firm.class #original line
-    end
+    #assert_equal Company, firm.class #original line
+    assert_equal Firm, firm.class
   end
 
   def test_new_with_accessible_inheritance_column
@@ -524,73 +518,6 @@ def test_find_or_create_by_bang_with_admin_role_with_attr_protected_attributes
   end
 end
 
-if active_record_40?
-  # This class should be deleted when we remove activerecord-deprecated_finders as a
-  # dependency.
-  class MassAssignmentSecurityDeprecatedFindersTest < ActiveSupport::TestCase
-    include MassAssignmentTestHelpers
-
-    def setup
-      super
-      @deprecation_behavior = ActiveSupport::Deprecation.behavior
-      ActiveSupport::Deprecation.behavior = :silence
-    end
-
-    def teardown
-      super
-      ActiveSupport::Deprecation.behavior = @deprecation_behavior
-    end
-
-    def test_find_or_initialize_by_with_attr_accessible_attributes
-      p = TightPerson.find_or_initialize_by_first_name('Josh', attributes_hash)
-
-      assert_default_attributes(p)
-    end
-
-    def test_find_or_initialize_by_with_admin_role_with_attr_accessible_attributes
-      p = TightPerson.find_or_initialize_by_first_name('Josh', attributes_hash, :as => :admin)
-
-      assert_admin_attributes(p)
-    end
-
-    def test_find_or_initialize_by_with_attr_protected_attributes
-      p = LoosePerson.find_or_initialize_by_first_name('Josh', attributes_hash)
-
-      assert_default_attributes(p)
-    end
-
-    def test_find_or_initialize_by_with_admin_role_with_attr_protected_attributes
-      p = LoosePerson.find_or_initialize_by_first_name('Josh', attributes_hash, :as => :admin)
-
-      assert_admin_attributes(p)
-    end
-
-    def test_find_or_create_by_with_attr_accessible_attributes
-      p = TightPerson.find_or_create_by_first_name('Josh', attributes_hash)
-
-      assert_default_attributes(p, true)
-    end
-
-    def test_find_or_create_by_with_admin_role_with_attr_accessible_attributes
-      p = TightPerson.find_or_create_by_first_name('Josh', attributes_hash, :as => :admin)
-
-      assert_admin_attributes(p, true)
-    end
-
-    def test_find_or_create_by_with_attr_protected_attributes
-      p = LoosePerson.find_or_create_by_first_name('Josh', attributes_hash)
-
-      assert_default_attributes(p, true)
-    end
-
-    def test_find_or_create_by_with_admin_role_with_attr_protected_attributes
-      p = LoosePerson.find_or_create_by_first_name('Josh', attributes_hash, :as => :admin)
-
-      assert_admin_attributes(p, true)
-    end
-  end
-end
-
 class MassAssignmentSecurityHasOneRelationsTest < ActiveSupport::TestCase
   include MassAssignmentTestHelpers
   include MassAssignmentRelationTestHelpers
diff --git a/test/mass_assignment_security/strong_parameters_fallback_test.rb b/test/mass_assignment_security/strong_parameters_fallback_test.rb
index f386bf2..5414279 100644
--- a/test/mass_assignment_security/strong_parameters_fallback_test.rb
+++ b/test/mass_assignment_security/strong_parameters_fallback_test.rb
@@ -35,17 +35,20 @@ class StrongParametersFallbackTest < ActiveSupport::TestCase
     assert_nothing_raised { TightPerson.find_or_create_by!(untrusted_params) }
   end
 
-  test "with PORO including MassAssignmentSecurity that uses a protection marco" do
+  test "with PORO including MassAssignmentSecurity that uses a protection macro" do
     klass = Class.new do
       include ActiveModel::MassAssignmentSecurity
       attr_protected :admin
     end
 
     untrusted_params = ActionController::Parameters.new(admin: true)
+    if Rails::VERSION::MAJOR == 5 && Rails::VERSION::MINOR == 0
+      untrusted_params = untrusted_params.to_h
+    end
     assert_equal({}, klass.new.send(:sanitize_for_mass_assignment, untrusted_params))
   end
 
-  test "with PORO including MassAssignmentSecurity that does not use a protection marco" do
+  test "with PORO including MassAssignmentSecurity that does not use a protection macro" do
     klass = Class.new do
       include ActiveModel::MassAssignmentSecurity
     end