diff --git a/Gemfile.lock b/Gemfile.lock
index 713e624..b3880b3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,7 +15,7 @@ GEM
       concurrent-ruby (~> 1.0)
     minitest (5.12.2)
     mustermann (1.0.3)
-    rack (2.0.7)
+    rack (2.2.3)
     rack-protection (2.0.7)
       rack
     sinatra (2.0.7)