diff --git a/Gemfile.lock b/Gemfile.lock
index 390b0d3..a8b31b9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -28,7 +28,7 @@ GEM
     mini_portile2 (2.1.0)
     nokogiri (1.7.0.1)
       mini_portile2 (~> 2.1.0)
-    rack (1.6.4)
+    rack (1.6.13)
     rake (10.3.2)
     ruby-rc4 (0.1.5)
     spoon (0.0.4)