diff --git a/Gemfile b/Gemfile
index 286ad7f..6461499 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,4 +6,13 @@ gemspec
 gem 'spring-commands-rspec', group: :development
 gem 'spring-commands-teaspoon', group: :development
 
-gem 'rails', '5.2.6'
+if ENV['PAGEFLOW_DEPENDENCIES'] == 'experimental'
+  git 'https://github.com/codevise/pageflow', branch: 'edge', glob: '**/*.gemspec' do
+    gem 'pageflow'
+    gem 'pageflow-support'
+  end
+
+  gem 'pageflow-external-links', git: 'https://github.com/codevise/pageflow-external-links'
+else
+  gem 'rails', '5.2.6'
+end
diff --git a/bin/rspec b/bin/rspec
index 91cf232..03365b6 100755
--- a/bin/rspec
+++ b/bin/rspec
@@ -4,7 +4,7 @@ ENV['RAILS_ENV'] ||= 'test'
 dummy_root = File.expand_path("../spec/dummy/rails-4.1.9", File.dirname(__FILE__))
 
 begin
-  load File.expand_path("../spring", __FILE__) if File.exists?(dummy_root)
+  load File.expand_path("../spring", __FILE__) if File.exist?(dummy_root)
 rescue LoadError
 end
 require 'bundler/setup'
diff --git a/lib/pageflow-linkmap-page.rb b/lib/pageflow-linkmap-page.rb
index 803bb3a..ba299ce 100644
--- a/lib/pageflow-linkmap-page.rb
+++ b/lib/pageflow-linkmap-page.rb
@@ -1,4 +1,5 @@
 require 'pageflow/linkmap_page/engine'
+require 'pageflow/linkmap_page/version'
 
 module Pageflow
   module LinkmapPage
diff --git a/lib/pageflow/linkmap_page/engine.rb b/lib/pageflow/linkmap_page/engine.rb
index 2cbcb7b..f3a1b19 100644
--- a/lib/pageflow/linkmap_page/engine.rb
+++ b/lib/pageflow/linkmap_page/engine.rb
@@ -1,13 +1,36 @@
 require 'pageflow-external-links'
+require 'paperclip'
+
+require 'pageflow/linkmap_page/paperclip_processors/colors'
+require 'pageflow/linkmap_page/paperclip_processors/color_mask'
+require 'pageflow/linkmap_page/paperclip_processors/invoke_callback'
+require 'pageflow/linkmap_page/paperclip_processors/image_dimensions'
 
 module Pageflow
   module LinkmapPage
     class Engine < Rails::Engine
       isolate_namespace Pageflow::LinkmapPage
 
-      config.autoload_paths << File.join(config.root, 'lib')
       config.i18n.load_path += Dir[config.root.join('config', 'locales', '**', '*.yml').to_s]
 
+      if Rails.respond_to?(:autoloaders)
+        lib = root.join('lib')
+
+        config.autoload_paths << lib
+        config.eager_load_paths << lib
+
+        initializer 'pageflow_linkmap_page.autoloading' do
+          Rails.autoloaders.main.ignore(
+            lib.join('generators'),
+            lib.join('pageflow-linkmap-page.rb'),
+            lib.join('pageflow/linkmap_page/paperclip_processors'),
+            lib.join('pageflow/linkmap_page/version.rb')
+          )
+        end
+      else
+        config.autoload_paths << File.join(config.root, 'lib')
+      end
+
       initializer 'pageflow_linkmap_page.paperclip' do
         Paperclip.configure do |config|
           config.register_processor(:pageflow_linkmap_page_image_colors,
diff --git a/pageflow-linkmap-page.gemspec b/pageflow-linkmap-page.gemspec
index b7cd54f..6a27b61 100644
--- a/pageflow-linkmap-page.gemspec
+++ b/pageflow-linkmap-page.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ['lib']
 
-  spec.required_ruby_version = '~> 2.1'
+  spec.required_ruby_version = '>= 2.1'
 
   spec.add_runtime_dependency 'pageflow', ['>= 15.7', '< 17']
   spec.add_runtime_dependency 'pageflow-external-links', '~> 2.x'
@@ -24,10 +24,15 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler', ['>= 1.0', '< 3']
   spec.add_development_dependency 'pageflow-support', ['>= 15.0', '< 17']
   spec.add_development_dependency 'rake', '~> 12.0'
-  spec.add_development_dependency 'rspec-rails', '~> 3.7'
   spec.add_development_dependency 'factory_bot_rails', '~> 4.8'
   spec.add_development_dependency 'sqlite3', '~> 1.3'
 
+  if ENV['PAGEFLOW_DEPENDENCIES'] == 'experimental'
+    spec.add_development_dependency 'rspec-rails', '~> 6.0'
+  else
+    spec.add_development_dependency 'rspec-rails', '~> 3.7'
+  end
+
   # Browser like integration testing
   spec.add_development_dependency 'capybara', '~> 2.13'