diff --git a/Gemfile.lock b/Gemfile.lock
index 77241ae..ad82b79 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -119,7 +119,7 @@ GEM
       mini_portile (~> 0.6.0)
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-contrib (1.2.0)
       rack (>= 0.9.1)
     rack-test (0.6.3)