diff --git a/CHANGELOG.md b/CHANGELOG.md
index 11984ac..0e537b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+# [4.1.0](https://github.com/socketio/socket.io-parser/compare/4.0.4...4.1.0) (2021-10-11)
+
+
+### Features
+
+* provide an ESM build with and without debug ([388c616](https://github.com/socketio/socket.io-parser/commit/388c616a9221e4341945f8487e729e93a81d2da5))
+
+
 ## [4.0.4](https://github.com/socketio/socket.io-parser/compare/4.0.3...4.0.4) (2021-01-15)
 
 
diff --git a/package-lock.json b/package-lock.json
index 58368f1..e310ed9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "socket.io-parser",
-  "version": "4.0.4",
+  "version": "4.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 223d4e0..420166f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "socket.io-parser",
-  "version": "4.0.4",
+  "version": "4.1.0",
   "description": "socket.io protocol parser",
   "repository": {
     "type": "git",