diff --git a/Gemfile b/Gemfile
index 61c5871..38df2d0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 gem 'rake', '13.4.2'
 gem 'asciidoctor', '2.0.26'
 
-gem 'json', '2.19.9'
+gem 'json', '2.20.0'
 gem 'awesome_print', '1.9.2'
 
 gem 'asciidoctor-fb2', '0.8.0'