diff --git a/pyproject.toml b/pyproject.toml
index 34a52da..366cbff 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,6 @@ build-backend = "setuptools.build_meta"
 name = "optunahub"
 description = "OptunaHub"
 readme = "README.md"
-license = {file = "LICENSE"}
 authors = [
   {name = "Optuna team"}
 ]