diff --git a/yaml/yaml3/Gemfile.lock b/yaml/yaml3/Gemfile.lock
index 10d5e60..c7db1bc 100644
--- a/yaml/yaml3/Gemfile.lock
+++ b/yaml/yaml3/Gemfile.lock
@@ -3,7 +3,7 @@ GEM
   specs:
     mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.6.2)
+    rack (2.2.6.4)
     rack-protection (2.2.3)
       rack
     ruby2_keywords (0.0.5)