diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2539302..b2ed56b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +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).
 
+## [3.4.0] - TBD
+### Added
+- `SMTPClient#sendAsync` API [#267](https://github.com/eleith/emailjs/issues/267)
+- `isRFC2822Date` API
+
+### Changed
+- use `WeakSet` instead of `WeakMap` for greylist tracking
+
+### Fixed
+- use camelCase style for internal function names
+- use correct types in jsdoc comments
+
 ## [3.3.0] - 2020-08-08
 ### Added
 - greylist support [#202](https://github.com/eleith/emailjs/issues/202)