diff --git a/CHANGELOG.md b/CHANGELOG.md
index d4119c9..a1979c1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,16 @@ This projects adheres to [Semantic Versioning](http://semver.org/) and [Keep a C
 ## [Unreleased][unreleased]
 -
 
+## [2.4.0] - 2023-03-21
+
+### Commits
+
+- Added `is_zero()` function. ([0ebce4a](https://github.com/pronamic/wp-money/commit/0ebce4a2e13682228d7f9bb79148d42e23fd74cc))
+
+Full set of changes: [`2.3.0...2.4.0`][2.4.0]
+
+[2.4.0]: https://github.com/pronamic/wp-money/compare/v2.3.0...v2.4.0
+
 ## [2.3.0] - 2023-03-21
 
 ### Commits
diff --git a/package.json b/package.json
index ced9bbf..14805b9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "wp-money",
-	"version": "2.3.0",
+	"version": "2.4.0",
 	"description": "WordPress Money library.",
 	"repository": {
 		"type": "git",
diff --git a/pronamic-money.php b/pronamic-money.php
index 131dc78..5516693 100644
--- a/pronamic-money.php
+++ b/pronamic-money.php
@@ -4,7 +4,7 @@
  * Plugin URI: https://www.pronamic.eu/plugins/pronamic-money/
  * Description: WordPress Money library.
  *
- * Version: 2.3.0
+ * Version: 2.4.0
  * Requires at least: 4.7
  * Requires PHP: 7.4
  *