asciidoctor-epub3.gemspec in asciidoctor-epub3-1.5.0.alpha.8 vs asciidoctor-epub3.gemspec in asciidoctor-epub3-1.5.0.alpha.9

@@ -14,29 +14,26 @@
   s.authors = ['Dan Allen', 'Sarah White']
   s.email = '[e-mail]'
   s.homepage = 'https://github.com/asciidoctor/asciidoctor-epub3'
   s.license = 'MIT'
 
-  s.required_ruby_version = '>= 1.9.3'
+  # NOTE required ruby version is informational only; it's not enforced since it can't be overridden and can cause builds to break
+  #s.required_ruby_version = '>= 2.3.0'
 
   files = begin
     (result = Open3.popen3('git ls-files -z') {|_, out| out.read }.split %(\0)).empty? ? Dir['**/*'] : result
   rescue
     Dir['**/*']
   end
-  s.files = files.grep %r/^(?:(?:data\/(?:fonts|images|styles)|lib)\/.+|Gemfile|Rakefile|(?:CHANGELOG|LICENSE|NOTICE|README)\.adoc|#{s.name}\.gemspec)$/
+  s.files = files.grep %r/^(?:(?:data\/(?:fonts|images|styles)|lib)\/.+|Gemfile|Rakefile|(?:CHANGELOG|LICENSE|NOTICE|README)\.adoc|\.yardopts|#{s.name}\.gemspec)$/
   s.executables = %w(asciidoctor-epub3 adb-push-ebook)
   s.test_files = s.files.grep(/^(?:test|spec|feature)\/.*$/)
 
   s.require_paths = ['lib']
 
-  s.has_rdoc = true
-  s.rdoc_options = ['--charset=UTF-8', '--title="Asciidoctor EPUB3"', '--main=README.adoc', '-ri']
-  s.extra_rdoc_files = ['CHANGELOG.adoc', 'LICENSE.adoc', 'NOTICE.adoc', 'README.adoc']
+  s.add_development_dependency 'rake', '~> 12.3.2'
 
-  s.add_development_dependency 'rake'
-  #s.add_development_dependency 'rdoc', '~> 4.1.0'
-
-  s.add_runtime_dependency 'asciidoctor', '~> 1.5.0'
-  s.add_runtime_dependency 'gepub', '~> 0.6.9.2'
+  s.add_runtime_dependency 'asciidoctor', '>= 1.5.0', '< 3.0.0'
+  s.add_runtime_dependency 'gepub', '~> 1.0.2'
   s.add_runtime_dependency 'thread_safe', '~> 0.3.6'
+  s.add_runtime_dependency 'concurrent-ruby', '~> 1.1.5'
 end