diff --git a/Gemfile b/Gemfile
index e313359..0c48452 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 gem "github-markup", "3.0.4"
 gem "RedCloth", "=4.3.2"
 gem "asciidoctor", "2.0.11"
-gem "commonmarker", "=0.21.0"
+gem "commonmarker", "0.23.0"
 gem "creole", "=0.5.0"
 gem "org-ruby", "=0.9.12"
 gem "rdoc", "=3.6.1"