diff --git a/Gemfile.lock b/Gemfile.lock
index 52efcdb..a8de2d5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -62,7 +62,7 @@ GEM
     minitest (5.7.0)
     nokogiri (1.6.6.2)
       mini_portile (~> 0.6.0)
-    rack (1.6.4)
+    rack (1.6.12)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.3)