diff --git a/app/Gemfile.lock b/app/Gemfile.lock
index 4423688..3def0d1 100644
--- a/app/Gemfile.lock
+++ b/app/Gemfile.lock
@@ -34,7 +34,7 @@ GEM
     mysql2 (0.5.2)
     pg (0.18.4)
     puma (3.12.6)
-    rack (2.2.6.4)
+    rack (2.2.8.1)
     rack-protection (2.2.4)
       rack
     ruby2_keywords (0.0.5)