diff --git a/apps/ruby-bundler/Gemfile.lock b/apps/ruby-bundler/Gemfile.lock
index 1220867..874295e 100644
--- a/apps/ruby-bundler/Gemfile.lock
+++ b/apps/ruby-bundler/Gemfile.lock
@@ -3,7 +3,7 @@ GEM
   specs:
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.6.4)
+    rack (2.2.8.1)
     rack-protection (2.2.0)
       rack
     ruby2_keywords (0.0.5)