diff --git a/docs/tutorials/preferential-optimization.rst b/docs/tutorials/preferential-optimization.rst
index 4d2644ea9..a192e883c 100644
--- a/docs/tutorials/preferential-optimization.rst
+++ b/docs/tutorials/preferential-optimization.rst
@@ -27,7 +27,7 @@ First, ensure the necessary packages are installed by executing the following co
 
 .. code-block:: console
 
-    $ pip install "optuna>=3.3.0" "optuna-dashboard>=0.13.0b1" pillow botorch
+    $ pip install "optuna>=3.3.0" "optuna-dashboard[preferential]>=0.13.0b1" pillow
 
 Next, execute the Python script, copied from `generator.py`_.
 
diff --git a/pyproject.toml b/pyproject.toml
index 9d8500dc1..1477ef4c4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,9 +52,12 @@ test = [
 optional = [
     "streamlit",
     "boto3",
-    "botorch",
+    "botorch>=0.8.1",
 ]
 
+preferential = [
+    "botorch>=0.8.1",
+]
 
 [project.scripts]
 optuna-dashboard = "optuna_dashboard._cli:main"