diff --git a/dyndnsd.gemspec b/dyndnsd.gemspec
index 1a5ecb7..163dd0c 100644
--- a/dyndnsd.gemspec
+++ b/dyndnsd.gemspec
@@ -40,7 +40,7 @@ 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', '~> 1.19.0'
+  s.add_development_dependency 'rubocop', '~> 1.20.0'
   s.add_development_dependency 'rubocop-rake', '~> 0.6.0'
   s.add_development_dependency 'rubocop-rspec', '~> 2.4.0'
   s.add_development_dependency 'solargraph', '~> 0.43.0'