messages_dictionary.gemspec in messages_dictionary-2.0.0 vs messages_dictionary.gemspec in messages_dictionary-2.1.0

@@ -22,9 +22,10 @@
 
   spec.add_dependency 'hashie', '~> 5.0'
   spec.add_dependency 'zeitwerk', '~> 2.4'
 
   spec.add_development_dependency 'codecov', '~> 0.1'
+  spec.add_development_dependency 'json', '~> 2'
   spec.add_development_dependency 'rake', '~> 13.0'
   spec.add_development_dependency 'rspec', '~> 3.6'
   spec.add_development_dependency 'rubocop',             '~> 1.6'
   spec.add_development_dependency 'rubocop-performance', '~> 1.5'
   spec.add_development_dependency 'rubocop-rake',        '~> 0.6'