diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a829c9..dcf57b7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,15 @@
+# [4.0.0](https://github.com/matteobad/focus-within-polyfill/compare/v3.1.0...v4.0.0) (2019-05-01)
+
+
+### Features
+
+* add new option and polyfill with attribute ([0d8bfeb](https://github.com/matteobad/focus-within-polyfill/commit/0d8bfeb)), closes [#11](https://github.com/matteobad/focus-within-polyfill/issues/11)
+
+
+### BREAKING CHANGES
+
+* attributes support
+
 # [3.1.0](https://github.com/matteobad/focus-within-polyfill/compare/v3.0.1...v3.1.0) (2019-04-26)
 
 
diff --git a/package-lock.json b/package-lock.json
index 160f936..b7c78be 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
 	"name": "focus-within-polyfill",
-	"version": "3.1.0",
+	"version": "4.0.0",
 	"lockfileVersion": 1,
 	"requires": true,
 	"dependencies": {
diff --git a/package.json b/package.json
index b8b15c6..a7f9b00 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "focus-within-polyfill",
-  "version": "3.1.0",
+  "version": "4.0.0",
   "description": "focus-within pseudo selector polyfill",
   "main": "dist/focus-within-polyfill.js",
   "module": "dist/focus-within-polyfill.mjs",
@@ -8,8 +8,8 @@
   "scripts": {
     "commit": "git-cz",
     "clean": "rimraf dist",
-	"lint": "eslint src/** test/**",
-	"lint:fix": "eslint src/** test/** --fix",
+    "lint": "eslint src/** test/**",
+    "lint:fix": "eslint src/** test/** --fix",
     "build": "rollup -c rollup.config.js --environment BUILD:production",
     "watch": "rollup -c rollup.config.js --environment BUILD:development -w",
     "prepublishOnly": "npm run clean && npm run lint && npm run test && npm run build",