diff --git a/Gemfile.lock b/Gemfile.lock
index b8832a7..a18a712 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -35,7 +35,7 @@ GEM
     multi_test (0.1.2)
     nokogiri (1.6.7.2)
       mini_portile2 (~> 2.0.0.rc2)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)