diff --git a/Gemfile.lock b/Gemfile.lock
index 7df4acc..7cb5696 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -72,7 +72,7 @@ GEM
     minitest (5.8.0)
     nokogiri (1.6.6.2)
       mini_portile (~> 0.6.0)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.3)