diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac4ba04b5f..3665b66adc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Fixed
+
+- Improved the error handling in the access endpoints (`POST` and `PUT`) to return `400 Bad Request` when granting access to a non-existent user
+
 ## 3.31.0 - 2026-07-20
 
 ### Changed