1 files changed, 1 insertions, 1 deletions
diff --git a/Gemfile b/Gemfile
index 9bba0cd..7c37dad 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gemspec
 gem 'asciidoctor', ENV['ASCIIDOCTOR_VERSION'], require: false if ENV.key? 'ASCIIDOCTOR_VERSION'
 
 group :optional do
-  gem 'epubcheck-ruby', '4.1.1.0'
+  gem 'epubcheck-ruby', '4.2.2.0'
   gem 'kindlegen', (Gem::Version.new RUBY_VERSION) < (Gem::Version.new '2.4.0') ? '3.0.3' : '3.0.5'
   gem 'pygments.rb', '1.2.1'
 end