diff --git a/Gemfile b/Gemfile
index 0893f08a..895c7294 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'asciidoctor-epub3', '2.1.3'
 gem 'asciidoctor-pdf', '2.3.17'
 
 gem 'coderay', '1.1.3'
-gem 'pygments.rb', '2.4.1'
+gem 'pygments.rb', '4.0.0'
 gem 'thread_safe', '0.3.6'
 gem 'epubcheck-ruby', '5.2.0.0'
 gem 'html-proofer', '5.0.9'