diff --git a/CHANGELOG.md b/CHANGELOG.md
index a815c846905..321dba96d17 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+Changes in [34.3.1](https://github.com/matrix-org/matrix-js-sdk/releases/tag/v34.3.1) (2024-08-20)
+==================================================================================================
+# Security
+- Fixes for [CVE-2024-42369](https://nvd.nist.gov/vuln/detail/CVE-2024-42369) / [GHSA-vhr5-g3pm-49fm](https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-vhr5-g3pm-49fm).
+
 Changes in [34.3.0](https://github.com/matrix-org/matrix-js-sdk/releases/tag/v34.3.0) (2024-08-13)
 ==================================================================================================
 ## ✨ Features
diff --git a/package.json b/package.json
index 29df7946551..4c15a7da265 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "matrix-js-sdk",
-    "version": "34.3.0",
+    "version": "34.3.1",
     "description": "Matrix Client-Server SDK for Javascript",
     "engines": {
         "node": ">=20.0.0"