public function render_html_email(
		Vulnerabilities $vulnerabilities,
		CssToInlineStyles $inliner = null
	) {
		$html = $this->template->render( 'emails/html/vulnerable.php', [
			'action_url' => admin_url( 'update-core.php' ),
			'vulnerabilities' => $vulnerabilities,
		] );
		$css = $this->template->render( 'emails/style.css' );
		$inliner = $inliner ?: new CssToInlineStyles();

		return $inliner->convert( $html, $css );
	}