diff --git a/Gemfile.lock b/Gemfile.lock
index 8a48944..9a17bc4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -86,7 +86,7 @@ GEM
     nokogiri (1.8.2)
       mini_portile2 (~> 2.3.0)
     pg (0.21.0)
-    rack (1.6.10)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.5)