diff --git a/Gemfile.lock b/Gemfile.lock
index a509a04..a4c6361 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -5,7 +5,7 @@ GEM
     erubis (2.7.0)
     multi_json (1.12.1)
     puma (3.12.0)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)