diff --git a/Gemfile.lock b/Gemfile.lock
index a5378b21..3b53f9df 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -79,7 +79,7 @@ GEM
     psych (2.0.17)
     puma (3.11.3)
     racc (1.4.14)
-    rack (1.6.9)
+    rack (1.6.12)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.10)