--- a/gitlab-markup.gemspec
+++ b/gitlab-markup.gemspec
@@ -26,5 +26,5 @@
   s.add_development_dependency 'minitest', '~> 5.4.3'
   s.add_development_dependency 'nokogiri', '~> 1.13.8'
   s.add_development_dependency 'nokogiri-diff', '~> 0.2.0'
-  s.add_development_dependency 'sanitize', '~> 5.1.0'
+  s.add_development_dependency 'sanitize', '~> 5.1'
 end