diff --git a/Gemfile.lock b/Gemfile.lock
index d90b1a2..21d3e88 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -142,7 +142,7 @@ GEM
     pg (0.21.0)
     public_suffix (3.0.3)
     puma (3.12.0)
-    rack (1.6.11)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.11.1)