diff --git a/Gemfile.lock b/Gemfile.lock
index 2f4bdab..00ff5b3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
     json (2.3.0)
     minitest (5.11.3)
     mustermann (1.0.3)
-    rack (2.2.3)
+    rack (2.2.3.1)
     rack-protection (2.0.4)
       rack
     rack-test (1.1.0)