diff --git a/tests/apps/ruby/Gemfile.lock b/tests/apps/ruby/Gemfile.lock
index 5f9e30098f0..73bbc294ee9 100644
--- a/tests/apps/ruby/Gemfile.lock
+++ b/tests/apps/ruby/Gemfile.lock
@@ -5,7 +5,7 @@ GEM
     eventmachine (1.2.7)
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.6.3)
+    rack (2.2.6.4)
     rack-protection (3.0.5)
       rack
     ruby2_keywords (0.0.5)