diff --git a/backend/app/Gemfile.lock b/backend/app/Gemfile.lock
index c72b88b..b1dd49c 100644
--- a/backend/app/Gemfile.lock
+++ b/backend/app/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
     json (1.8.3)
     kgio (2.10.0)
     multi_json (1.11.2)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)