diff --git a/birthday/Gemfile.lock b/birthday/Gemfile.lock
index a551166..f6faf63 100644
--- a/birthday/Gemfile.lock
+++ b/birthday/Gemfile.lock
@@ -86,7 +86,7 @@ GEM
       rake (>= 0.8.7)
       rdoc (~> 3.4)
       thor (>= 0.14.6, < 2.0)
-    rake (0.9.2.2)
+    rake (13.0.1)
     rdoc (3.12)
       json (~> 1.4)
     ruby2ruby (1.3.1)