diff --git a/HISTORY.rst b/HISTORY.rst
index 18549d7e..50f952f2 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -4,7 +4,16 @@ Change Log
 All notable changes to this project will be documented in this file.
 This project adheres to `Semantic Versioning <http://semver.org/>`__.
 
+63.4.3 - 2026-09-02
+-------------------
+
+Fixed
+~~~~~
+
+- Added 'thunderbird' as a secondary owner for enterprise repos
+
 63.4.2 - 2026-08-12
+-------------------
 
 Fixed
 ~~~~~
diff --git a/pyproject.toml b/pyproject.toml
index 8500cbef..12bbdd9e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "scriptworker"
-version = "63.4.2"
+version = "63.4.3"
 description = "Taskcluster scriptworker"
 authors = [
     { name = "Mozilla Release Engineering", email = "releng@mozilla.com" },