config.gemspec in config-1.7.2 vs config.gemspec in config-2.0.0

@@ -19,49 +19,30 @@
   s.files = `git ls-files`.split($/)
   s.files.select! { |file| /(^lib\/|\.md$|\.gemspec$)/ =~ file }
   s.files += Dir.glob('doc/**/*')
 
   s.require_paths         = ['lib']
-  s.required_ruby_version = '>= 2.0.0'
+  s.required_ruby_version = '>= 2.4.0'
 
+  s.add_dependency 'activesupport', '>= 4.2'
   s.add_dependency 'deep_merge', '~> 1.2', '>= 1.2.1'
+  s.add_dependency 'dry-schema', '~> 1.0'
 
-  if RUBY_VERSION >= '2.2'
-    s.add_dependency 'activesupport',  '>= 3.0'
-    s.add_dependency 'dry-validation', '~> 0.12', '>= 0.12.2', '< 1.0.0'
-
-    s.add_development_dependency 'rails', '~> 5.2',   '>= 5.2.2'
-  end
-
-  if RUBY_VERSION >= '2.1' && RUBY_VERSION < '2.2'
-    s.add_dependency 'activesupport',    '>= 3.0', '< 5.0.0'
-    s.add_dependency 'dry-configurable', '~> 0.5.0'
-    s.add_dependency 'dry-logic',        '~> 0.5.0'
-    s.add_dependency 'dry-validation',   '~> 0.10', '>= 0.10.7', '< 1.0.0'
-    s.add_dependency 'i18n',             '~> 0.9.0'
-
-    s.add_development_dependency 'rails', '< 5.0.0'
-  end
-
-  s.add_development_dependency 'bundler',     '~> 1.13',  '>= 1.13.6'
   s.add_development_dependency 'rake',        '~> 12.0',  '>= 12.0.0'
 
   # Testing
   s.add_development_dependency 'appraisal',   '~> 2.2',   '>= 2.2.0'
+  s.add_development_dependency 'rails',       '~> 5.2',   '>= 5.2.2'
   s.add_development_dependency 'rspec',       '~> 3.7',   '>= 3.7.0'
   s.add_development_dependency 'rspec-rails', '~> 3.7',   '>= 3.7.2'
   s.add_development_dependency 'test-unit',   '~> 3.2',   '>= 3.2.7'
   s.add_development_dependency 'sqlite3',     '~> 1.3',   '>= 1.3.13'
 
   # Static code analysis
   s.add_development_dependency 'mdl',         '~> 0.5',   '>= 0.5.0'
 
-  # Version 0.51 drops support for Ruby 2.0
-  s.add_development_dependency 'rubocop',     '~> 0.50',  '< 0.51' if RUBY_VERSION < '2.1'
-  # Version 0.58 drops support for Ruby 2.1
-  s.add_development_dependency 'rubocop',     '~> 0.57',  '< 0.58' if RUBY_VERSION >= '2.1' && RUBY_VERSION < '2.2'
   # Version 0.62 requires Ruby 2.2
-  s.add_development_dependency 'rubocop',     '~> 0.62'            if RUBY_VERSION >= '2.2'
+  s.add_development_dependency 'rubocop',     '~> 0.62'
 
   if ENV['TRAVIS']
     s.add_development_dependency 'codeclimate-test-reporter', '~> 1.0.9'
     s.add_development_dependency 'simplecov', '~> 0.13.0'
   end