diff --git a/Gemfile.lock b/Gemfile.lock
index 9619ed6..af481ca 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -16,7 +16,7 @@ GEM
     mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     public_suffix (5.0.0)
-    rack (2.2.4)
+    rack (2.2.6.3)
     rack-protection (2.2.2)
       rack
     rake (13.0.6)