diff --git a/Gemfile.lock b/Gemfile.lock
index 25da158..a2390d8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -108,7 +108,7 @@ GEM
     public_suffix (5.0.4)
     pygments.rb (2.4.1)
     racc (1.7.3)
-    rack (3.0.8)
+    rack (3.0.9.1)
     rackup (2.1.0)
       rack (>= 3)
       webrick (~> 1.8)