diff --git a/Gemfile.lock b/Gemfile.lock
index c1a0672..7e1399c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
     ghp-bootstrap (0.0.4)
     nanoc (3.4.3)
       cri (~> 2.2)
-    redcarpet (2.2.2)
+    redcarpet (3.5.1)
 
 PLATFORMS
   ruby