diff --git a/pyproject.toml b/pyproject.toml
index 58e5113..49cd972 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,6 @@ authors = [
 classifiers = [
     'Development Status :: 4 - Beta',
     'Programming Language :: Python',
-    'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
     'Topic :: Multimedia :: Graphics',
     'Programming Language :: Python :: 3.10',
     'Programming Language :: Python :: 3.11',
@@ -28,6 +27,7 @@ dependencies = [
     'click~=8.1.3',
     'setuptools_dso~=2.9'
 ]
+license = "GPL-3.0-or-later"
 
 [project.urls]
 Source = 'https://github.com/SkyTemple/tilequant/'