How to change the value of another field in Formik?

Question

JavaScript

Hello, please tell me how to change the value of another field in onChange () of the first field?
I'll show you with an example:

<form onSubmit={handleSubmit}>
  <Typeahead
    name="firstField"
    onChange={firstField => {
      setFieldValue("firstField", firstField);
    }}
    onInputChange={firstField => {
      setFieldValue("firstField", firstField);
    }}
    options={data}
    labelKey="key"
  />

  <Typeahead
    name="secondField"
    onChange={secondField => {
      setFieldValue({
        secondField: secondField, //текущее поле менят свое значение
        firstField: "testValue" //при этом первое не меняется
      });
    }}
    onInputChange={secondField => {
      setFieldValue("secondField", secondField);
    }}
    options={data}
    labelKey="key"
  />
</form>

Thanks in advance for your reply.