diff --git a/CHANGELOG.md b/CHANGELOG.md
index c32b044..d89f433 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 # History
 
+- [5.2.1](#521-2023-08-01) (Aug 2023)
 - [5.2.0](#520-2023-07-31) (Jul 2023)
 - [5.1.0](#510-2023-06-11) (Jun 2023)
 - [5.0.7](#507-2023-05-24) (May 2023)
@@ -21,6 +22,12 @@
 
 # Release notes
 
+## [5.2.1](https://github.com/socketio/engine.io-parser/compare/5.2.0...5.2.1) (2023-08-01)
+
+The format of the WebTransport frame has been slightly updated.
+
+
+
 ## [5.2.0](https://github.com/socketio/engine.io-parser/compare/5.1.0...5.2.0) (2023-07-31)
 
 
diff --git a/package.json b/package.json
index 5967ac9..ba92992 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "engine.io-parser",
   "description": "Parser for the client for the realtime Engine",
   "license": "MIT",
-  "version": "5.2.0",
+  "version": "5.2.1",
   "main": "./build/cjs/index.js",
   "module": "./build/esm/index.js",
   "exports": {