Gemfile in asciidoctor-epub3-1.5.0.alpha.11 vs Gemfile in asciidoctor-epub3-1.5.0.alpha.12

@@ -6,11 +6,9 @@
 gemspec
 
 gem 'asciidoctor', ENV['ASCIIDOCTOR_VERSION'], require: false if ENV.key? 'ASCIIDOCTOR_VERSION'
 
 group :optional do
-  gem 'epubcheck-ruby', '4.2.2.0'
-  gem 'kindlegen', (Gem::Version.new RUBY_VERSION) < (Gem::Version.new '2.4.0') ? '3.0.3' : '3.0.5'
   gem 'pygments.rb', '1.2.1'
 end
 
 group :docs do
   gem 'yard', require: false