diff --git a/Gemfile.lock b/Gemfile.lock
index d7d5d7b4..ed4e39b6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -265,7 +265,7 @@ GEM
       nio4r (~> 2.0)
     raabro (1.4.0)
     racc (1.8.1)
-    rack (3.1.13)
+    rack (3.1.21)
     rack-session (2.1.0)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)