diff --git a/CHANGELOG.md b/CHANGELOG.md
index b711083..2d05fce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## [4.0.0](https://github.com/tonioriol/transmutant/compare/v3.1.0...v4.0.0) (2024-11-01)
+
+
+### ⚠ BREAKING CHANGES
+
+* **types:** Changed Extra type parameter default from unknown to undefined for better type inference and runtime behavior alignment.
+
+### Code Refactoring
+
+* **types:** switch Extra type parameter default to undefined ([83c5a56](https://github.com/tonioriol/transmutant/commit/83c5a563dc5ccd5d8e04d3f86e0dd139dae4a346))
+
 ## [3.1.0](https://github.com/tonioriol/transmutant/compare/v3.0.0...v3.1.0) (2024-10-31)
 
 
diff --git a/package-lock.json b/package-lock.json
index 35306ac..6e40862 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "transmutant",
-  "version": "3.1.0",
+  "version": "4.0.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "transmutant",
-      "version": "3.1.0",
+      "version": "4.0.0",
       "license": "MIT",
       "devDependencies": {
         "@types/jest": "^29.5.14",
diff --git a/package.json b/package.json
index 3066a0f..2c1a518 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "transmutant",
-  "version": "3.1.0",
+  "version": "4.0.0",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "files": [