diff --git a/Gemfile.lock b/Gemfile.lock
index 9067574..484efd3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    asciidoctor (2.0.21)
+    asciidoctor (2.0.22)
     ast (2.4.2)
     commonmarker (0.23.10)
     docopt (0.6.1)