diff --git a/sensu-plugins-graphite.gemspec b/sensu-plugins-graphite.gemspec
index 9d2c45d..2179123 100644
--- a/sensu-plugins-graphite.gemspec
+++ b/sensu-plugins-graphite.gemspec
@@ -41,7 +41,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency 'bundler',                   '~> 1.7'
   s.add_development_dependency 'codeclimate-test-reporter', '~> 1.0'
-  s.add_development_dependency 'github-markup',             '~> 3.0'
+  s.add_development_dependency 'github-markup',             '~> 4.0'
   s.add_development_dependency 'pry',                       '~> 0.10'
   s.add_development_dependency 'rake',                      '~> 12.3'
   s.add_development_dependency 'redcarpet',                 '~> 3.2'