diff --git a/Gemfile.lock b/Gemfile.lock
index 0f3fde1..14f370b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -180,7 +180,7 @@ GEM
       activesupport (>= 3.0.0)
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
-    rack (1.6.4)
+    rack (1.6.12)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.5)