diff --git a/package/samplers/auto_sampler/README.md b/package/samplers/auto_sampler/README.md
index 96bddde9..efeefd6f 100644
--- a/package/samplers/auto_sampler/README.md
+++ b/package/samplers/auto_sampler/README.md
@@ -3,7 +3,7 @@ author: Optuna Team
 title: AutoSampler
 description: This sampler automatically chooses an appropriate built-in sampler for the provided objective function.
 tags: [sampler, automatic, automated]
-optuna_versions: [4.0.0]
+optuna_versions: [4.1.0]
 license: MIT License
 ---
 
diff --git a/package/samplers/auto_sampler/requirements.txt b/package/samplers/auto_sampler/requirements.txt
index 10fd7a0f..52b403bd 100644
--- a/package/samplers/auto_sampler/requirements.txt
+++ b/package/samplers/auto_sampler/requirements.txt
@@ -1,3 +1,4 @@
 scipy
 torch
 cmaes
+optuna>=4.1.0