diff --git a/Gemfile.lock b/Gemfile.lock
index dc0accd..514ba99 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -111,7 +111,7 @@ GEM
       byebug (~> 13.0)
       pry (>= 0.13, < 0.17)
     racc (1.8.1)
-    rack (3.1.20)
+    rack (3.1.21)
     rackup (0.2.3)
       rack (>= 3.0.0.beta1)
       webrick