diff --git a/Gemfile.lock b/Gemfile.lock
index 2238a40..6fbf1cd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -28,7 +28,7 @@ GEM
       faraday_middleware (~> 0.7.0)
       hashie (~> 1.2.0)
       multi_json (~> 1.0.2)
-    rack (1.4.1)
+    rack (1.6.12)
     sass (3.1.15)
     yajl-ruby (1.1.0)