diff --git a/awkward-cpp/pyproject.toml b/awkward-cpp/pyproject.toml
index ed71c2ad55..989e8f3e28 100644
--- a/awkward-cpp/pyproject.toml
+++ b/awkward-cpp/pyproject.toml
@@ -37,6 +37,7 @@ classifiers = [
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "Topic :: Scientific/Engineering",
     "Topic :: Scientific/Engineering :: Information Analysis",
     "Topic :: Scientific/Engineering :: Mathematics",