diff --git a/Gemfile.lock b/Gemfile.lock
index 8ab2017..71c4905 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
     multi_xml (0.6.0)
     mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.6.2)
+    rack (2.2.6.4)
     rack-protection (2.2.3)
       rack
     rake (13.0.3)