diff --git a/Gemfile.lock b/Gemfile.lock
index 4ae6388..9a09cf5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -81,7 +81,7 @@ GEM
       mini_portile (~> 0.6.0)
     pg (0.18.3)
     power_assert (0.2.4)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.3)