diff --git a/pyproject.toml b/pyproject.toml
index eb83ba57b..8997ff18a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,8 +2,8 @@
 build-backend = "setuptools.build_meta"
 requires = [
   "Cython>=0.29",
-  "oldest-supported-numpy ; python_version < '3.9'",
-  "numpy>=2.0.0rc1 ; python_version >= '3.9'",
+  'numpy>=2.0.0rc1; python_version >= "3.9"',
+  'oldest-supported-numpy; python_version < "3.9"',
   "setuptools>=61",
 ]
 
@@ -46,6 +46,7 @@ classifiers = [
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
   "Topic :: Software Development :: Libraries :: Python Modules",
   "Topic :: System :: Archiving :: Compression",
 ]