diff --git a/Gemfile.lock b/Gemfile.lock
index 57e3e91..aa5807c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -220,7 +220,7 @@ 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-protection (1.5.3)
       rack
     rack-test (0.6.2)