diff --git a/Gemfile.lock b/Gemfile.lock
index 141a0026b0..30ecc07923 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
       tzinfo (~> 1.1)
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
-    asciidoctor (1.5.7.1)
+    asciidoctor (1.5.8)
     coderay (1.1.2)
     colored (1.2)
     colorize (0.8.1)