diff --git a/README.md b/README.md
index 38375e7..4657eb5 100644
--- a/README.md
+++ b/README.md
@@ -2,8 +2,8 @@
   <img src="https://github.com/jcubic/sysend.js/blob/master/assets/logo.svg?raw=true" alt="Sysend.js logo"/>
 </p>
 
-[![npm](https://img.shields.io/badge/npm-1.16.2-blue.svg)](https://www.npmjs.com/package/sysend)
-![bower](https://img.shields.io/badge/bower-1.16.2-yellow.svg)
+[![npm](https://img.shields.io/badge/npm-1.16.3-blue.svg)](https://www.npmjs.com/package/sysend)
+![bower](https://img.shields.io/badge/bower-1.16.3-yellow.svg)
 ![downloads](https://img.shields.io/npm/dt/sysend.svg)
 [![jsdelivr](https://img.shields.io/jsdelivr/npm/hm/sysend)](https://www.jsdelivr.com/package/npm/sysend)
 
diff --git a/package.json b/package.json
index 1ce1394..c0bd7c0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sysend",
-  "version": "1.16.2",
+  "version": "1.16.3",
   "description": "Communication and Synchronization between browser tabs/windows. Works cross-domain.",
   "main": "sysend.js",
   "typings": "sysend.d.ts",
diff --git a/sysend.d.ts b/sysend.d.ts
index 9658f2b..d40da47 100644
--- a/sysend.d.ts
+++ b/sysend.d.ts
@@ -1,29 +1,29 @@
 /**@license
- *  sysend.js - send messages between browser windows/tabs version 1.16.2
+ *  sysend.js - send messages between browser windows/tabs version 1.16.3
  *
  *  Copyright (C) 2014-2023 Jakub T. Jankiewicz <https://jcubic.pl/me>
  *  Released under the MIT license
  *
  */
-type callback = (message: unknown, event: string) => void;
+type callback<T> = (message: T, event: string) => void;
 
 interface Sysend {
     id: string;
-    broadcast(event: string, data?: unknown): void;
+    broadcast<T>(event: string, data?: T): void;
     emit(event: string, data?: unknown): void;
-    on(event: string, callback: callback): void;
-    off(event: string, callback?: callback): void;
+    on<T>(event: string, callback: callback<T>): void;
+    off<T>(event: string, callback?: callback<T>): void;
     proxy(...args: string[]): void;
-    serializer(to: (data: unknown) => string, from: (data: string) => unknown): void;
+    serializer<T>(to: (data: T) => string, from: (data: string) => T): void;
     track(event: 'open', callback: (data: {id: string, count: number, primary: boolean}) => void): void;
     track(event: 'close', callback: (data: {id: string, count: number, primary: boolean, self: boolean}) => void): void;
     track(event: 'primary', callback: () => void): void;
-    track(event: 'message', callback: (payload: {data: unknown, origin: string}) => void): void;
+    track<T>(event: 'message', callback: (payload: {data: T, origin: string}) => void): void;
     track(event: 'secondary', callback: () => void): void;
     track(event: 'update', callback: (payload: Array<{ id: string, primary: boolean }>) => void): void;
     untrack(event: 'open' | 'close' | 'primary' | 'secondary' | 'message' | 'update', fn?: (input?: unknown) => void): void;
     list(): Promise<Array<{ id: string, primary: boolean }>>;
-    post(target: string, data?: unknown): void;
+    post<T>(target: string, data?: T): void;
     channel(...domains: string[]): void;
     isPrimary(): boolean;
     rpc<T extends Array<unknown>, U>(object: Record<string, (...args: T) => U>): Promise<Record<string, (id: string, ...args: T) => Promise<U>>>
diff --git a/sysend.js b/sysend.js
index 200d5f5..10098fa 100644
--- a/sysend.js
+++ b/sysend.js
@@ -1,5 +1,5 @@
 /**@license
- *  sysend.js - send messages between browser windows/tabs version 1.16.2
+ *  sysend.js - send messages between browser windows/tabs version 1.16.3
  *
  *  Copyright (C) 2014-2023 Jakub T. Jankiewicz <https://jcubic.pl/me>
  *  Released under the MIT license