diff --git a/openvpn-status-web.gemspec b/openvpn-status-web.gemspec
index 013de59..d558722 100644
--- a/openvpn-status-web.gemspec
+++ b/openvpn-status-web.gemspec
@@ -38,7 +38,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rack-test'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec'
-  s.add_development_dependency 'rubocop', '~> 1.39.0'
+  s.add_development_dependency 'rubocop', '~> 1.40.0'
   s.add_development_dependency 'rubocop-rake', '~> 0.6.0'
   s.add_development_dependency 'rubocop-rspec', '~> 2.15.0'
   s.add_development_dependency 'solargraph', '~> 0.47.0'