diff --git a/Gemfile.lock b/Gemfile.lock
index 7741a54..4e0f057 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -34,7 +34,7 @@ GEM
     multi_xml (0.6.0)
     mustermann (1.0.3)
     public_suffix (3.0.3)
-    rack (2.0.6)
+    rack (2.2.3)
     rack-protection (2.0.5)
       rack
     rake (10.5.0)