diff --git a/Gemfile.lock b/Gemfile.lock
index 836a014..7221929 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -120,7 +120,7 @@ GEM
     pg (0.18.4)
     puma (4.3.0)
       nio4r (~> 2.0)
-    rack (1.6.11)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.8)