diff --git a/Gemfile.lock b/Gemfile.lock
index 051221c..56167b3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,7 +12,7 @@ GEM
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     netrc (0.11.0)
-    rack (2.2.2)
+    rack (2.2.6.4)
     rack-protection (2.0.8.1)
       rack
     rest-client (2.1.0)