diff --git a/z_web/z_rails/Gemfile.lock b/z_web/z_rails/Gemfile.lock
index c795aa9..56b6d41 100644
--- a/z_web/z_rails/Gemfile.lock
+++ b/z_web/z_rails/Gemfile.lock
@@ -56,7 +56,7 @@ GEM
     multi_json (1.3.6)
     pg (0.14.0)
     polyglot (0.3.3)
-    rack (1.4.1)
+    rack (1.4.7)
     rack-cache (1.2)
       rack (>= 0.4)
     rack-ssl (1.3.2)