iso-bib-item.gemspec in iso-bib-item-0.1.5 vs iso-bib-item.gemspec in iso-bib-item-0.1.6

@@ -28,6 +28,7 @@
   spec.add_development_dependency 'rspec', '~> 3.0'
   spec.add_development_dependency 'simplecov'
 
   spec.add_dependency 'isoics', '~> 0.1.6'
   spec.add_dependency 'nokogiri'
+  spec.add_dependency 'duplicate'
 end