diff --git a/CHANGELOG.md b/CHANGELOG.md
index 673cc9b9..6433400c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+## [0.4.0]
+
 This pre-release improves compatible with the [PHP RdKafka extension](https://github.com/arnaud-lb/php-rdkafka) ^4.0 and ^5.0.
 
 ### Added
@@ -69,7 +71,8 @@ Special thanks to [@siad007](https://github.com/siad007) and [@carusogabriel]( h
 - Add examples and basic documentation
 - Add benchmarks
 
-[Unreleased]: https://github.com/idealo/php-rdkafka-ffi/compare/v0.3.0...HEAD
+[Unreleased]: https://github.com/idealo/php-rdkafka-ffi/compare/v0.4.0...HEAD
+[0.3.0]: https://github.com/idealo/php-rdkafka-ffi/compare/v0.3.0...v0.4.0
 [0.3.0]: https://github.com/idealo/php-rdkafka-ffi/compare/v0.2.0...v0.3.0
 [0.2.0]: https://github.com/idealo/php-rdkafka-ffi/compare/v0.1.0...v0.2.0
 [0.1.0]: https://github.com/idealo/php-rdkafka-ffi/releases/tag/v0.1.0
\ No newline at end of file
diff --git a/src/RdKafka/FFI/Library.php b/src/RdKafka/FFI/Library.php
index 3114ca78..dc9b3451 100644
--- a/src/RdKafka/FFI/Library.php
+++ b/src/RdKafka/FFI/Library.php
@@ -29,7 +29,7 @@ class Library
 
     public const VERSION_AUTODETECT = '';
     public const VERSION_LATEST = '1.8.2';
-    public const PHP_LIBRARY_VERSION = '0.3.0';
+    public const PHP_LIBRARY_VERSION = '0.4.0';
 
     private static FFI $ffi;
     private static string $scope = 'RdKafka';