diff --git a/Gemfile.lock b/Gemfile.lock
index 5ce85678..01de9f94 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -91,7 +91,7 @@ GEM
       slop (~> 3.4)
     puma (2.4.0)
       rack (>= 1.1, < 2.0)
-    rack (1.5.2)
+    rack (1.6.12)
     rack-protection (1.5.0)
       rack
     rack-test (0.6.2)