diff --git a/CHANGELOG.md b/CHANGELOG.md
index c3045d9..61143c7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,20 @@
-Version 4.2.3-dev
+Version 4.2.4-dev
 -----------------
 
 Nothing yet.
 
+Version 4.2.3 (2019-08-12)
+--------------------------
+
+### Added
+
+* [PHP 7.4] Add support for numeric literal separators. (#615)
+
+### Fixed
+
+* Fixed resolution of return types for arrow functions. (#613)
+* Fixed compatibility with PHP 7.4.
+
 Version 4.2.2 (2019-05-25)
 --------------------------
 
diff --git a/README.md b/README.md
index e62748e..f1dd929 100644
--- a/README.md
+++ b/README.md
@@ -3,10 +3,10 @@ PHP Parser
 
 [![Build Status](https://travis-ci.org/nikic/PHP-Parser.svg?branch=master)](https://travis-ci.org/nikic/PHP-Parser) [![Coverage Status](https://coveralls.io/repos/github/nikic/PHP-Parser/badge.svg?branch=master)](https://coveralls.io/github/nikic/PHP-Parser?branch=master)
 
-This is a PHP 5.2 to PHP 7.3 parser written in PHP. Its purpose is to simplify static code analysis and
+This is a PHP 5.2 to PHP 7.4 parser written in PHP. Its purpose is to simplify static code analysis and
 manipulation.
 
-[**Documentation for version 4.x**][doc_master] (stable; for running on PHP >= 7.0; for parsing PHP 5.2 to PHP 7.3).
+[**Documentation for version 4.x**][doc_master] (stable; for running on PHP >= 7.0; for parsing PHP 5.2 to PHP 7.4).
 
 [Documentation for version 3.x][doc_3_x] (unsupported; for running on PHP >= 5.5; for parsing PHP 5.2 to PHP 7.2).
 
diff --git a/doc/0_Introduction.markdown b/doc/0_Introduction.markdown
index 13e6caa..433cf10 100644
--- a/doc/0_Introduction.markdown
+++ b/doc/0_Introduction.markdown
@@ -1,7 +1,7 @@
 Introduction
 ============
 
-This project is a PHP 5.2 to PHP 7.3 parser **written in PHP itself**.
+This project is a PHP 5.2 to PHP 7.4 parser **written in PHP itself**.
 
 What is this for?
 -----------------
@@ -26,11 +26,11 @@ programmatic PHP code analysis are incidentally PHP developers, not C developers
 What can it parse?
 ------------------
 
-The parser supports parsing PHP 5.2-7.3.
+The parser supports parsing PHP 5.2-7.4.
 
 As the parser is based on the tokens returned by `token_get_all` (which is only able to lex the PHP
 version it runs on), additionally a wrapper for emulating tokens from newer versions is provided.
-This allows to parse PHP 7.3 source code running on PHP 7.0, for example. This emulation is somewhat
+This allows to parse PHP 7.4 source code running on PHP 7.0, for example. This emulation is somewhat
 hacky and not perfect, but it should work well on any sane code.
 
 What output does it produce?