Change Default jQuery in Wp

Add in function.php file

function replace_core_jquery_version() {
	wp_deregister_script( 'jquery' );
	wp_register_script( 'jquery', "https://code.jquery.com/jquery-3.4.1.min.js", array(), '3.1.1' );
}
add_action( 'wp_enqueue_scripts', 'replace_core_jquery_version' );