Discord API v10 Bio changer

Here is my part of code

 bio = 'Changing bio omg... '
 r = requests.patch(url="https://discord.com/api/v10/users/@me", 
                   headers= {"Authorization": f'Bot {token}',
                            "Content-Type": "application/json",}, 
                   json =json.dumps({" bio": bio))
print(r.content) 

But I get:

b'{"code": 50035, "errors": {"_errors": [{"code": "DICT_TYPE_CONVERT", "message": "Only dictionaries may be used in a DictType"}]}, "message": "Invalid Form Body"}'