diff --git a/ruby/Gemfile.lock b/ruby/Gemfile.lock
index 9d6ab90c168..e0adf902a60 100644
--- a/ruby/Gemfile.lock
+++ b/ruby/Gemfile.lock
@@ -1455,7 +1455,7 @@ GEM
       prettyprint
     prettyprint (0.1.1)
     racc (1.8.1)
-    rack (3.1.20)
+    rack (3.1.21)
     rack-protection (4.2.0)
       base64 (>= 0.1.0)
       logger (>= 1.6.0)