diff --git a/Gemfile.lock b/Gemfile.lock
index a055408..4760f63 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -105,7 +105,7 @@ GEM
       stringio
     public_suffix (7.0.5)
     racc (1.8.1)
-    rack (3.1.16)
+    rack (3.1.21)
     rake (13.3.0)
     rdf (3.3.4)
       bcp47_spec (~> 0.2)