diff --git a/python/CHANGELOG.rst b/python/CHANGELOG.rst
index bdd0543206..2af4a8654b 100644
--- a/python/CHANGELOG.rst
+++ b/python/CHANGELOG.rst
@@ -18,6 +18,11 @@
 - TreeSequences and TableCollections now have a ``metadata_size`` property,
   returning their size in bytes. (:user:`petrelharp`, :pr:`3475`)
 
+**Bugfixes**
+
+- Update to kastore C version 2.1.3 to include file security fix (:user:`jeromekelleher`, 
+  :pr:`3478`).
+
 --------------------
 [1.0.3] - 2026-05-14
 --------------------