diff --git a/Gemfile b/Gemfile
index 405429c61..ad83f7011 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'rake', '13.0.3'
-gem 'asciidoctor', '2.0.12'
+gem 'asciidoctor', '2.0.18'
 
 gem 'json', '2.5.1'
 gem 'awesome_print', '1.8.0'