diff --git a/Gemfile.lock b/Gemfile.lock
index 14199ba2..3b97fea7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -45,7 +45,7 @@ GEM
     minitest (5.3.1)
     multi_json (1.9.2)
     polyglot (0.3.4)
-    rack (1.5.2)
+    rack (1.6.13)
     rack-protection (1.5.2)
       rack
     rake (10.1.1)