diff --git a/sensu-plugins-etcd.gemspec b/sensu-plugins-etcd.gemspec
index 61a5ecd..b3909bd 100644
--- a/sensu-plugins-etcd.gemspec
+++ b/sensu-plugins-etcd.gemspec
@@ -37,7 +37,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'pry',                       '~> 0.10'
   s.add_development_dependency 'rake',                      '~> 10.5'
   s.add_development_dependency 'redcarpet',                 '~> 3.2'
-  s.add_development_dependency 'rubocop',                   '~> 0.40.0'
+  s.add_development_dependency 'rubocop',                   '~> 0.50.0'
   s.add_development_dependency 'rspec',                     '~> 3.4'
   s.add_development_dependency 'yard',                      '~> 0.8'
 end