diff --git a/Gemfile b/Gemfile
index 60c316aa..276b82c8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem 'asciidoctor-epub3', '1.5.1'
 gem 'asciidoctor-pdf', '2.3.4'
 
 gem 'coderay', '1.1.3'
-gem 'pygments.rb', '2.3.0'
+gem 'pygments.rb', '2.3.1'
 gem 'thread_safe', '0.3.6'
 gem 'epubcheck-ruby', '4.2.6.0'
 gem 'html-proofer', '4.4.1'