diff --git a/docs/whats-new.rst b/docs/whats-new.rst
index 89afa8ae..45e03252 100644
--- a/docs/whats-new.rst
+++ b/docs/whats-new.rst
@@ -18,7 +18,7 @@ What's new
   ============ ==============  ==============
 
   By `Justus Magin <https://github.com/keewis>`_.
-- add support for python 3.11 (:pull:`228`)
+- add support for python 3.11 and 3.12 (:pull:`228`)
   By `Justus Magin <https://github.com/keewis>`_.
 - ignore datetime units on attributes (:pull:`241`)
   By `Justus Magin <https://github.com/keewis>`_.
diff --git a/pyproject.toml b/pyproject.toml
index 051fa9b4..61300d90 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,6 +16,7 @@ classifiers = [
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "Topic :: Scientific/Engineering",
 ]
 requires-python = ">=3.9"