diff --git a/Gemfile.lock b/Gemfile.lock
index 987b952..88a2d9c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,7 +7,7 @@ GEM
       fssm (>= 0.2.7)
       sass (~> 3.2.19)
     fssm (0.2.10)
-    rack (1.5.2)
+    rack (1.6.13)
     rack-protection (1.5.3)
       rack
     sass (3.2.19)