diff --git a/Gemfile.lock b/Gemfile.lock
index 8276a67..c94dfc8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -74,7 +74,7 @@ GEM
     multi_json (1.11.2)
     nokogiri (1.6.7.1)
       mini_portile2 (~> 2.0.0.rc2)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.5)