diff --git a/Gemfile.lock b/Gemfile.lock
index 2cc929a..d06a1eb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -46,7 +46,7 @@ GEM
     psych (5.1.2)
       stringio
     racc (1.8.1)
-    rack (3.1.12)
+    rack (3.1.13)
     rack-session (2.1.0)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)