diff --git a/Gemfile.lock b/Gemfile.lock
index 903a809..86fc9da 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,7 +14,7 @@ GEM
     execjs (2.7.0)
     multi_json (1.13.1)
     mustermann (1.0.3)
-    rack (2.0.7)
+    rack (2.0.9.3)
     rack-protection (2.0.5)
       rack
     rufus-scheduler (3.4.2)