diff --git a/Gemfile.lock b/Gemfile.lock
index ccadd14..3db8d02 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -77,7 +77,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    rack (1.5.2)
+    rack (1.5.5)
     rb-fsevent (0.9.4)
     rb-inotify (0.9.5)
       ffi (>= 0.5.0)