From b0f9c179ea008dfa35f231224d2113425fac15b1 Mon Sep 17 00:00:00 2001
From: Tom Deakin <tom.deakin@bristol.ac.uk>
Date: Wed, 22 Dec 2021 13:03:40 +0000
Subject: [PATCH] version bump changelog

---
 CHANGELOG.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3e1040d..903cb02 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,10 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
-## [Unreleased]
+## Unreleased
+- None
+
+## [v4.0] - 2021-12-22
 
 ### Added
 - New implementation using the C++ parallel STL (C++17).