Can't update CPT Fields using wp_update_post

I’m using the following array to update a CPT using wp_update_post() but the CPT fields are not updated. I’m not getting any errors.

$update_post = array(

‘ID’ => $post->ID,

‘post_title’ => $_POST,

‘plazo_de_renta’ => $_POST,

‘renta_mensual’ => $_POST,

);