diff --git a/advanced_topics/01_debugging_with_save_and_open/Gemfile.lock b/advanced_topics/01_debugging_with_save_and_open/Gemfile.lock
index f6a8eec..3520bfa 100644
--- a/advanced_topics/01_debugging_with_save_and_open/Gemfile.lock
+++ b/advanced_topics/01_debugging_with_save_and_open/Gemfile.lock
@@ -22,7 +22,7 @@ GEM
     nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
     public_suffix (3.1.1)
-    rack (2.0.7)
+    rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rake (12.3.3)