diff --git a/.gitignore b/.gitignore
index 79a8ac0..390a11b 100755
--- a/.gitignore
+++ b/.gitignore
@@ -89,8 +89,7 @@ celerybeat-schedule
 .env
 
 # virtualenv
-venv35/
-venv27/
+venv*/
 venv/
 ENV/
 
diff --git a/CHANGES.rst b/CHANGES.rst
index 0c4732e..1d40379 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,8 +1,8 @@
 Changes
 =======
 
-Unreleased
-----------
+0.4.0 (2023-11-30)
+------------------
 
 - Add support for Python 3.12.
 
diff --git a/README.rst b/README.rst
index 20d482f..6ac8627 100644
--- a/README.rst
+++ b/README.rst
@@ -97,7 +97,7 @@ Requirements :
 
 - `Numpy <https://numpy.org>`_
 
--  Only for building from source: C compiler, Python C headers and optionally Cython.
+-  Only for building from source: C compiler, Python C headers, setuptools and Cython.
 
 
 Motivation :
diff --git a/jenkspy/__init__.py b/jenkspy/__init__.py
index 1b396ee..6fe1477 100644
--- a/jenkspy/__init__.py
+++ b/jenkspy/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
-__version__ = "0.3.3"
+__version__ = "0.4.0"
 
 from .core import jenks_breaks
 from .core import _jenks_matrices