diff --git a/sensu-plugins-bigpanda.gemspec b/sensu-plugins-bigpanda.gemspec
index b3ec4c0..e9f3430 100644
--- a/sensu-plugins-bigpanda.gemspec
+++ b/sensu-plugins-bigpanda.gemspec
@@ -32,7 +32,7 @@ Gem::Specification.new do |s| # rubocop:disable Metrics/BlockLength
 
   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'