diff --git a/examples/advanced/requirements.txt b/examples/advanced/requirements.txt
index fb2988c..34a1bf0 100644
--- a/examples/advanced/requirements.txt
+++ b/examples/advanced/requirements.txt
@@ -1,4 +1,5 @@
 exceptiongroup>=1.1.3,<2.0.0
-sniffio>=1.3.0,<2.0.0
+packaging>=23.1
 certifi>=2023.7.22
 fastapi[all]>=0.101.1,<1.0.0
+gunicorn>=21.2.0,<22.0.0