mail-notify.gemspec in mail-notify-0.1.0 vs mail-notify.gemspec in mail-notify-0.2.0

@@ -30,8 +30,8 @@
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency 'rspec-rails', '~> 3.8'
   spec.add_development_dependency 'rubocop', '~> 0.63'
   spec.add_development_dependency 'sqlite3', '~> 1.4.1'
 
-  spec.add_dependency 'actionmailer', '~> 5.0'
+  spec.add_dependency 'actionmailer', '>= 5.0', '< 6.1'
   spec.add_dependency 'notifications-ruby-client', '~> 3.1'
 end