diff --git a/Gemfile.lock b/Gemfile.lock
index e7349f6..ae13d80 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -20,7 +20,7 @@ GEM
     i18n (0.6.11)
     json (1.8.1)
     minitest (5.4.0)
-    rack (1.5.2)
+    rack (1.6.13)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.2)