diff --git a/Gemfile.lock b/Gemfile.lock
index ad5f001..6b69ad6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -109,7 +109,7 @@ GEM
       rack (>= 1.1, < 2.0)
     quiet_assets (1.0.3)
       railties (>= 3.1, < 5.0)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-test (0.6.2)
       rack (>= 1.0)
     rails (4.1.6)