diff --git a/recipes/002_registration.py b/recipes/002_registration.py
index 7d5eb94a..484db2be 100644
--- a/recipes/002_registration.py
+++ b/recipes/002_registration.py
@@ -67,7 +67,7 @@
       title: Demo Sampler
       description: Demo Sampler of OptunaHub
       tags: [sampler]
-      optuna_versions: [3.6.1]
+      optuna_versions: [4.0.0]
       license: MIT License
       ---