diff --git a/Gemfile.lock b/Gemfile.lock
index a47e9b8..0b34569 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -18,7 +18,7 @@ GEM
     minitest (5.4.1)
     multi_json (1.10.1)
     netrc (0.7.7)
-    rack (1.5.2)
+    rack (1.6.12)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.2)