diff --git a/week3/sample_app/Gemfile.lock b/week3/sample_app/Gemfile.lock
index 6ea638c..c9bcd82 100644
--- a/week3/sample_app/Gemfile.lock
+++ b/week3/sample_app/Gemfile.lock
@@ -113,7 +113,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     puma (3.9.1)
-    rack (2.2.2)
+    rack (2.2.3.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.1.6)