I've got this state and change function

const [mitarbeiter, setMitarbeiter] = useState({
    lastName: "",
    firstName: "",
    quartal: "",
    snummer: "",
    email: "",
    eintrittsdatum: "",
    austrittsdatum: "",
    isAushilfe: false,
});

const handleChange = (event) => {
    const value = event.target.value;
    
    setMitarbeiter({
        ...mitarbeiter,
        [event.target.name]: value
    });
    console.log(event.target.name)
    console.log(mitarbeiter)
};

This is my input field where i try to insert something and want it to update the lastName value of my state

<input id="name" type="text" placeholder="Name.." defaultValue="" value={mitarbeiter.lastName} onChange={handleChange}/>

Does someone know where my error is? It just creates a new value and does not change the previous one and i cant input any text into the input field