Update changelog

Author: electerious

CHANGELOG.md

@@ -4,14 +4,18 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [3.6.0] - 2026-04-08
 
-Code refactoring, internal improvements and dependency updates to bring the codebase up to date with the latest versions and features of Node.js and MongoDB.
+Code refactoring, internal improvements and dependency updates to bring the codebase up to date with the latest versions and features of Node.js and MongoDB (fixes #377).
 
 ### Changed
 
 - Ackee now requires Node.js 24 or newer
 
+### Fixed
+
+- Vercel deployments and serverless functions (#401, #385)
+
 ## [3.5.1] - 2025-11-19
 
 ### Changed