diff --git a/pyproject.toml b/pyproject.toml
index 72dede3..25cdb5f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,6 +7,7 @@ requires-python = ">=3.8"
 authors = [
     {name = "Inada Naoki", email = "songofacandy@gmail.com"}
 ]
+license = {text = "GNU General Public License v2 or later (GPLv2+)"}
 keywords = ["MySQL"]
 classifiers = [
     "Development Status :: 5 - Production/Stable",