isodoc.gemspec in isodoc-2.10.6 vs isodoc.gemspec in isodoc-2.10.7

@@ -53,7 +53,8 @@
   spec.add_development_dependency "rspec", "~> 3.6"
   spec.add_development_dependency "rubocop", "~> 1.5.2"
   spec.add_development_dependency "sassc", "~> 2.4.0"
   spec.add_development_dependency "simplecov", "~> 0.15"
   spec.add_development_dependency "timecop", "~> 0.9"
+  spec.add_development_dependency "xml-c14n"
   # spec.metadata["rubygems_mfa_required"] = "true"
 end