diff --git a/Gemfile.lock b/Gemfile.lock
index a3d287a..2a52f08 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -57,7 +57,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     racc (1.8.1)
-    rack (3.1.16)
+    rack (3.1.21)
     rack-protection (4.1.1)
       base64 (>= 0.1.0)
       logger (>= 1.6.0)