diff --git a/pyproject.toml b/pyproject.toml
index 6b9ad462..1eb2b38c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ name = "calibreweb"
 description = "Web app for browsing, reading and downloading eBooks stored in a Calibre database."
 authors = [{name = "@OzzieIsaacs", email = "Ozzie.Fernandez.Isaacs@googlemail.com"}]
 maintainers = [{name = "@OzzieIsaacs"}]
-license = {text = "GPLv3+"}
+license = "GPL-3.0-or-later"
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "License :: OSI Approved :: GNU Affero General Public License v3",