Update current user's primary blog after creating a blog in wordpress multisite

I wanted to update the current user’s primary blog to the blog created after blog signup on wp-signup.php form. So that the current user’s primary blog is set to the blog he had created.

I tried this but its not working,

add_action('wpmu_new_blog','update_primary_blog',10);

    function update_primary_blog() {
    global $wpdb;
    update_user_meta( get_current_user_id(), 'primary_blog', $wpdb->insert_id );
    }

Is there another way to do it?