diff --git a/Gemfile.lock b/Gemfile.lock
index 25bed6d..b472b15 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -150,7 +150,7 @@ GEM
     pry-remote (0.1.7)
       pry (~> 0.9)
       slop (~> 3.0)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-test (0.6.2)
       rack (>= 1.0)
     rails (4.0.0)