diff --git a/Gemfile.lock b/Gemfile.lock
index 2ad72f7..6482125 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -46,7 +46,7 @@ GEM
       rack (>= 1.2, < 3)
     power_assert (0.3.1)
     public_suffix (2.0.4)
-    rack (2.0.7)
+    rack (2.2.3)
     rake (11.3.0)
     rdoc (4.2.2)
       json (~> 1.4)