diff --git a/Gemfile.lock b/Gemfile.lock
index 636f566..02592c3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -92,7 +92,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.9.0)
     ptools (1.3.3)
-    rack (1.6.4)
+    rack (1.6.13)
     rb-fsevent (0.9.7)
     rb-inotify (0.9.7)
       ffi (>= 0.5.0)