diff --git a/CHANGELOG.md b/CHANGELOG.md
index fa09a60..dfc447f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+## [4.5.0](https://github.com/eturino/ts-key-set/compare/v4.4.2...v4.5.0) (2021-02-04)
+
+
+### Features
+
+* added `ks.union(other)` ([cde30b5](https://github.com/eturino/ts-key-set/commit/cde30b512a91a21e199c743bcac4a04132743bae))
+
 ### [4.4.2](https://github.com/eturino/ts-key-set/compare/v4.4.1...v4.4.2) (2021-02-04)
 
 ### [4.4.1](https://github.com/eturino/ts-key-set/compare/v4.4.0...v4.4.1) (2021-01-26)
diff --git a/package.json b/package.json
index 3731475..0c6af6f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@eturino/key-set",
-  "version": "4.4.2",
+  "version": "4.5.0",
   "author": "Eduardo Turiño <eturino@eturino.com>",
   "description": "KeySet with 4 classes to represent concepts of All, None, Some, and AllExceptSome, the last 2 with a sorted uniq list of keys, and all with intersection calculations (TypeScript port of https://github.com/eturino/ruby_key_set)",
   "main": "build/main/index.js",