diff --git a/Gemfile.lock b/Gemfile.lock
index f59b76e..0b8e93d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,7 +10,7 @@ GEM
     listen (0.7.3)
     nanoc (3.6.2)
       cri (~> 2.3)
-    rack (1.5.2)
+    rack (2.0.7)
     rb-fsevent (0.9.3)
 
 PLATFORMS