diff --git a/birthday/Gemfile.lock b/birthday/Gemfile.lock
index a551166..119f593 100644
--- a/birthday/Gemfile.lock
+++ b/birthday/Gemfile.lock
@@ -64,7 +64,7 @@ GEM
     mime-types (1.18)
     multi_json (1.3.6)
     polyglot (0.3.3)
-    rack (1.4.1)
+    rack (1.4.7)
     rack-cache (1.2)
       rack (>= 0.4)
     rack-ssl (1.3.2)