diff --git a/notebooks/ReleaseNotes.ipynb b/notebooks/ReleaseNotes.ipynb
index 315407fa..1bbd9dde 100644
--- a/notebooks/ReleaseNotes.ipynb
+++ b/notebooks/ReleaseNotes.ipynb
@@ -26,6 +26,15 @@
     "Major changes will show up here as we make them."
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Version 1.2.3 (released 2024-11-09)\n",
+    "\n",
+    "* Work around an error in the `showast` module, occurring in notebooks running Python 3.12 and later"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},