diff --git a/Gemfile.lock b/Gemfile.lock
index 81a086d..2700891 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -124,7 +124,7 @@ GEM
     pg (0.18.1-x86-mingw32)
     puma (2.11.0)
       rack (>= 1.1, < 2.0)
-    rack (1.6.0)
+    rack (1.6.13)
     rack-cors (0.3.1)
     rack-test (0.6.3)
       rack (>= 1.0)