diff --git a/Gemfile.lock b/Gemfile.lock
index df03dd8e..acab6ddc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -84,7 +84,7 @@ GEM
       multi_json (~> 1.0)
       pusher-signature (~> 0.1.8)
     pusher-signature (0.1.8)
-    rack (1.6.4)
+    rack (1.6.12)
     rack-protection (1.5.5)
       rack
     rake (11.2.2)