diff --git a/Gemfile b/Gemfile
index 951ae73a318d29f37ac04d8811ebf27953401821..3655b0857519778e7a95f9ff4c351881e424bf43 100644
--- a/Gemfile
+++ b/Gemfile
@@ -150,7 +150,7 @@ gem 'wikicloth', '0.8.1'
 gem 'asciidoctor', '~> 2.0.10'
 gem 'asciidoctor-include-ext', '~> 0.3.1', require: false
 gem 'asciidoctor-plantuml', '0.0.10'
-gem 'rouge', '~> 3.11.0'
+gem 'rouge', '~> 3.15.0'
 gem 'truncato', '~> 0.7.11'
 gem 'bootstrap_form', '~> 4.2.0'
 gem 'nokogiri', '~> 1.10.5'
diff --git a/Gemfile.lock b/Gemfile.lock
index 0bf630b42eff88e5d88615b2e392a9568f757943..377213bc882f4d8a9cb61de1c538309d4fcf19bf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -873,7 +873,7 @@ GEM
     retriable (3.1.2)
     rinku (2.0.0)
     rotp (2.1.2)
-    rouge (3.11.0)
+    rouge (3.15.0)
     rqrcode (0.7.0)
       chunky_png
     rqrcode-rails3 (0.1.7)