diff --git a/Ruby/progate/rails5_study_5/tweet_app/Gemfile.lock b/Ruby/progate/rails5_study_5/tweet_app/Gemfile.lock
index 9a44d04d..f7c5c60f 100644
--- a/Ruby/progate/rails5_study_5/tweet_app/Gemfile.lock
+++ b/Ruby/progate/rails5_study_5/tweet_app/Gemfile.lock
@@ -99,7 +99,7 @@ GEM
     puma (4.3.12)
       nio4r (~> 2.0)
     racc (1.6.2)
-    rack (2.2.4)
+    rack (2.2.6.4)
     rack-test (2.0.2)
       rack (>= 1.3)
     rails (5.2.8.1)