diff --git a/back-end/Gemfile.lock b/back-end/Gemfile.lock
index b464141..09dd4f0 100644
--- a/back-end/Gemfile.lock
+++ b/back-end/Gemfile.lock
@@ -76,7 +76,7 @@ GEM
     nokogiri (1.10.5-x86-mingw32)
       mini_portile2 (~> 2.4.0)
     puma (3.8.2)
-    rack (2.0.1)
+    rack (2.2.3)
     rack-cors (1.0.5)
       rack (>= 1.6.0)
     rack-test (0.6.3)