diff --git a/2013-JAX/Gemfile.lock b/2013-JAX/Gemfile.lock
index 2e91c1d..c464dbb 100644
--- a/2013-JAX/Gemfile.lock
+++ b/2013-JAX/Gemfile.lock
@@ -77,7 +77,7 @@ GEM
       slop (~> 3.4)
     puma (1.6.3)
       rack (~> 1.2)
-    rack (1.5.2)
+    rack (1.5.5)
     rb-inotify (0.9.0)
       ffi (>= 0.5.0)
     redcarpet (2.3.0)