diff --git a/sensu-plugins-process-checks.gemspec b/sensu-plugins-process-checks.gemspec
index ab9f543..2b90ca9 100644
--- a/sensu-plugins-process-checks.gemspec
+++ b/sensu-plugins-process-checks.gemspec
@@ -36,7 +36,7 @@ Gem::Specification.new do |s| # rubocop: disable Metrics/BlockLength
   s.add_runtime_dependency 'sys-proctable', '>= 0.9.8', '< 1.3.0'
 
   s.add_development_dependency 'bundler',                   '~> 2.1'
-  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',                      '~> 13.0'
   s.add_development_dependency 'redcarpet',                 '~> 3.2'