diff --git a/CHANGELOG.md b/CHANGELOG.md
index 52b1ea8..313139f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.0]
+
 ### Added
 
 - Builtin function documentation generation from C++ Musique implementation source code
diff --git a/config.mk b/config.mk
index c26d027..2a6688d 100644
--- a/config.mk
+++ b/config.mk
@@ -1,8 +1,8 @@
 MAKEFLAGS="-j $(grep -c ^processor /proc/cpuinfo)"
 
-MAJOR := 0
-MINOR := 3
-PATCH := 1
+MAJOR := 4
+MINOR := 0
+PATCH := 0
 COMMIT := gc$(shell git rev-parse --short HEAD 2>/dev/null)
 
 ifeq ($(COMMIT),gc)