diff --git a/app_backend/Gemfile.lock b/app_backend/Gemfile.lock
index ffd62ac..27997b0 100644
--- a/app_backend/Gemfile.lock
+++ b/app_backend/Gemfile.lock
@@ -34,7 +34,7 @@ GEM
       pry (~> 0.10)
     psych (3.1.0)
     public_suffix (3.0.3)
-    rack (2.0.6)
+    rack (2.2.3)
     rack-protection (2.0.5)
       rack
     rack-test (1.1.0)