diff --git a/yaml/yaml2/Gemfile.lock b/yaml/yaml2/Gemfile.lock
index d150837..53ecd9c 100644
--- a/yaml/yaml2/Gemfile.lock
+++ b/yaml/yaml2/Gemfile.lock
@@ -3,7 +3,7 @@ GEM
   specs:
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.6.2)
+    rack (2.2.6.3)
     rack-protection (2.2.0)
       rack
     ruby2_keywords (0.0.5)