diff --git a/Gemfile.lock b/Gemfile.lock
index a0d79620..8e8b3c73 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    asciidoctor (1.5.7.1)
+    asciidoctor (1.5.8)
 
 PLATFORMS
   ruby