diff --git a/RELEASE_NOTES.rst b/RELEASE_NOTES.rst
index e90475245..24a7501c9 100644
--- a/RELEASE_NOTES.rst
+++ b/RELEASE_NOTES.rst
@@ -10,6 +10,8 @@ Please familiarize yourself with these to foster an open and welcoming community
 All changes
 -----------
 
+- :mod:`message_ix` is tested and compatible with `Python 3.13 <https://www.python.org/downloads/release/python-3130/>`__ (:pull:`881`).
+- Support for Python 3.8 is dropped (:pull:`881`), as it has reached end-of-life.
 - Add option to :func:`.util.copy_model` from a non-default location of model files (:pull:`877`).
 
 .. _v3.9.0: