diff --git a/Gemfile b/Gemfile
index 3321641df..9d174518b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ gem 'asciidoctor', '2.0.11'
 gem 'json', '2.3.1'
 gem 'awesome_print', '1.8.0'
 
-gem 'asciidoctor-epub3', '1.5.0.alpha.18'
+gem 'asciidoctor-epub3', '1.5.0.alpha.19'
 gem 'asciidoctor-pdf', '1.5.3'
 
 gem 'coderay', '1.1.3'