diff --git a/Gemfile.lock b/Gemfile.lock
index 7ff85da..c85a644 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -208,7 +208,7 @@ GEM
     powerpack (0.1.1)
     public_suffix (3.0.1)
     puma (3.10.0)
-    rack (1.6.11)
+    rack (1.6.12)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.11.1)