diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6d43b09..795d4e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,10 +2,20 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+[4.0.0] - 2023-11-02
+-------------------------
+##### Removed
+- Support for NodeJS 16.
+
+##### Changed
+- Updated dependencies.
+- Switched to installation with **yarn** instead of npm.
+- Added support for modern npm versions.
+
 [3.0.1] - 2023-07-11
 -------------------------
 ##### Added
-- Support for linux/arm64
+- Support for linux/arm64.
 
 [3.0.0] - 2023-07-10
 -------------------------
diff --git a/README.md b/README.md
index 76eca48..d804302 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ Live demo web application (meant for testing purposes only) that uses Enketo Val
 
 ## Prerequisites
 
-1. install nodeJS 18 or 20
+1. install Node 18 or 20 and Yarn 1 ("classic")
 2. (if necessary) install build tools for native modules with `apt-get install build-essential`
 3. (if necessary) install puppeteer (headless Chrome) prerequisites as mentioned [here](https://github.com/puppeteer/puppeteer/blob/main/docs/troubleshooting.md#chrome-headless-doesnt-launch-on-unix), e.g. for Ubuntu/Debian do `apt-get install ca-certificates fonts-liberation libappindicator3-1 libasound2 libatk-bridge2.0-0 libatk1.0-0 libc6 libcairo2 libcups2 libdbus-1-3 libexpat1 libfontconfig1 libgbm1 libgcc1 libglib2.0-0 libgtk-3-0 libnspr4 libnss3 libpango-1.0-0 libpangocairo-1.0-0 libstdc++6 libx11-6 libx11-xcb1 libxcb1 libxcomposite1 libxcursor1 libxdamage1 libxext6 libxfixes3 libxi6 libxrandr2 libxrender1 libxss1 libxtst6 lsb-release wget xdg-utils`
 
diff --git a/package.json b/package.json
index 93100de..53fdd5e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "enketo-validate",
-    "version": "3.0.1",
+    "version": "4.0.0",
     "description": "An XForm validator around Enketo's form engine",
     "main": "src/validator.js",
     "bin": "./validate",