diff --git a/Gemfile.lock b/Gemfile.lock
index f5a3b13..d886d91 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -104,7 +104,7 @@ GEM
     psych (5.1.2)
       stringio
     racc (1.7.3)
-    rack (3.0.8)
+    rack (3.0.9.1)
     rack-protection (4.0.0)
       base64 (>= 0.1.0)
       rack (>= 3.0.0, < 4)