diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2010f11..2f6c002 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,22 @@
 # Changelog
 
+## [4.0.0] - 2022-07-01
+
+_If you are upgrading: please see [`UPGRADING.md`](UPGRADING.md)._
+
+### Changed
+
+- **Breaking:** bump [`readable-stream`](https://github.com/nodejs/readable-stream) from 3 to 4 ([`082b8d6`](https://github.com/Level/level-ws/commit/082b8d6)) (Vincent Weevers)
+- **Breaking:** use classes, requiring `new` ([`dafafb2`](https://github.com/Level/level-ws/commit/dafafb2)) (Vincent Weevers)
+- **Breaking:** drop Node.js 10 ([`817c30c`](https://github.com/Level/level-ws/commit/817c30c)) (Vincent Weevers)
+
+### Fixed
+
+- Cleanup README and add missing docs for options ([`94a2a8e`](https://github.com/Level/level-ws/commit/94a2a8e)) (Vincent Weevers).
+
 ## [3.0.0] - 2021-04-25
 
-_**If you are upgrading:** please see [`UPGRADING.md`](UPGRADING.md)._
+_If you are upgrading: please see [`UPGRADING.md`](UPGRADING.md)._
 
 ### Changed
 
@@ -102,6 +116,8 @@ _**If you are upgrading:** please see [`UPGRADING.md`](UPGRADING.md)._
 
 :seedling: Initial release.
 
+[4.0.0]: https://github.com/Level/level-ws/releases/tag/v4.0.0
+
 [3.0.0]: https://github.com/Level/level-ws/compare/v2.0.0...v3.0.0
 
 [2.0.0]: https://github.com/Level/level-ws/compare/v1.0.0...v2.0.0
diff --git a/UPGRADING.md b/UPGRADING.md
index 5367d60..e99416d 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -2,6 +2,22 @@
 
 This document describes breaking changes and how to upgrade. For a complete list of changes including minor and patch releases, please refer to the [changelog](CHANGELOG.md).
 
+## 4.0.0
+
+Drops support of Node.js 10, upgrades to `readable-stream@4` ([`082b8d6`](https://github.com/Level/level-ws/commit/082b8d6)) and uses classes which means `new` is now required. If you previously did:
+
+```js
+const WriteStream = require('level-ws')
+const ws = WriteStream(db)
+```
+
+You must now do:
+
+```js
+const WriteStream = require('level-ws')
+const ws = new WriteStream(db)
+```
+
 ## 3.0.0
 
 This release drops support of legacy runtime environments ([Level/community#98](https://github.com/Level/community/issues/98)):
diff --git a/package.json b/package.json
index 2d26a78..cc8f70e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "level-ws",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "description": "A basic writable stream for abstract-level databases",
   "license": "MIT",
   "main": "level-ws.js",