diff --git a/web/ruby/app/Gemfile.lock b/web/ruby/app/Gemfile.lock
index a640d61..eaf2330 100644
--- a/web/ruby/app/Gemfile.lock
+++ b/web/ruby/app/Gemfile.lock
@@ -19,7 +19,7 @@ GEM
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     mysql2 (0.5.3)
-    rack (2.2.2)
+    rack (2.2.6.2)
     rack-protection (2.0.8.1)
       rack
     ruby2_keywords (0.0.2)