asciidoctor-epub3.gemspec in asciidoctor-epub3-1.5.0.alpha.17 vs asciidoctor-epub3.gemspec in asciidoctor-epub3-1.5.0.alpha.18

@@ -29,9 +29,10 @@
   s.test_files = s.files.grep(/^(?:test|spec|feature)\/.*$/)
 
   s.require_paths = ['lib']
 
   s.add_development_dependency 'asciidoctor-diagram', '>= 1.5.0', '< 3.0.0'
+  s.add_development_dependency 'asciimath', '~> 2.0'
   s.add_development_dependency 'coderay', '~> 1.1.0'
   s.add_development_dependency 'pygments.rb', '~> 1.2.0'
   s.add_development_dependency 'rake', '~> 13.0.0'
   s.add_development_dependency 'rouge', '~> 3.0'
   s.add_development_dependency 'rspec', '~> 3.9.0'