diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3fd40d3..de611d5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ 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]
+
+## [0.4.0] - 2024-03-02
 - fix bug in todo tag serialization
 
 ## [0.3.0] - 2024-02-17
diff --git a/mxtodo-searcher/Cargo.toml b/mxtodo-searcher/Cargo.toml
index 1064773..6ce746d 100644
--- a/mxtodo-searcher/Cargo.toml
+++ b/mxtodo-searcher/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mxtodo_searcher"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Robert Voyer <robert.voyer@gmail.com>"]
 edition = "2018"
 description = "A very purpose-built library that uses ripgrep to search for TODO items in a directory of Markdown files."
diff --git a/mxtodo.el b/mxtodo.el
index 0740b8d..5671f56 100644
--- a/mxtodo.el
+++ b/mxtodo.el
@@ -3,7 +3,7 @@
 ;; Copyright (C) 2021 Robert Voyer.
 
 ;; Author: Robert Voyer <robert.voyer@gmail.com>
-;; Version: 0.3.0
+;; Version: 0.4.0
 ;; Package-Requires: ((emacs "27.1") (dash "2.19.0") (f "0.20.0") (ts "1.2.2"))
 ;; Keywords: calendar, convenience
 ;; URL: https://github.com/rlvoyer/mxtodo