diff --git a/Gemfile.lock b/Gemfile.lock
index 5d20c5c..d550530 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,7 +15,7 @@ GEM
     json (2.1.0)
     minitest (5.11.3)
     mustermann (1.0.2)
-    rack (2.0.4)
+    rack (2.2.3)
     rack-protection (2.0.1)
       rack
     rack-test (0.8.3)