diff --git a/Gemfile.lock b/Gemfile.lock
index c4ca8f4..e2f7dc5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -26,7 +26,7 @@ GEM
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     ptools (1.3.7)
-    rack (2.2.3)
+    rack (2.2.6.2)
     rack-cors (1.0.6)
       rack (>= 1.6.0)
     rack-protection (2.0.8.1)