acme-client.gemspec in acme-client-2.0.8 vs acme-client.gemspec in acme-client-2.0.9

@@ -23,8 +23,9 @@
     spec.add_development_dependency 'rake', '~> 13.0'
   end
   spec.add_development_dependency 'rspec', '~> 3.9'
   spec.add_development_dependency 'vcr', '~> 2.9'
   spec.add_development_dependency 'webmock', '~> 3.8'
+  spec.add_development_dependency 'webrick'
 
   spec.add_runtime_dependency 'faraday', '>= 0.17', '< 2.0.0'
 end