diff --git a/pyproject.toml b/pyproject.toml
index 96d29c75..00ef0db9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,10 +40,12 @@ optuna-dashboard = "optuna_dashboard._cli:main"
 version = {attr = "optuna_dashboard.__version__"}
 
 [tool.setuptools]
-packages = ["optuna_dashboard"]
 include-package-data = false
 package-data = { "optuna_dashboard" = ["public/*", "img/*", "index.html"] }
 
+[tool.setuptools.packages.find]
+include = ["optuna_dashboard*"]
+
 [project.urls]
 "Homepage" = "https://github.com/optuna/optuna-dashboard"
 "Sources" = "https://github.com/optuna/optuna-dashboard"