Refresh.php

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<?php
namespace Magento\Captcha\Controller\Adminhtml\Refresh;

class Refresh extends \Magento\Backend\App\Action
{
    protected $serializer;

    protected $captchaHelper;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Captcha\Helper\Data $captchaHelper,
        \Magento\Framework\Serialize\Serializer\Json $serializer
    ) {
        parent::__construct($context);
        $this->serializer = $serializer;
        $this->captchaHelper = $captchaHelper;
    }

    public function execute()
    {
        $formId = $this->getRequest()->getPost('formId');
        $captchaModel = $this->captchaHelper->getCaptcha($formId);
        $this->_view->getLayout()->createBlock(
            $captchaModel->getBlockName()
        )->setFormId(
            $formId
        )->setIsAjax(
            true
        )->toHtml();
        $this->getResponse()->representJson($this->serializer->serialize(['imgSrc' => $captchaModel->getImgSrc()]));
        $this->_actionFlag->set('', self::FLAG_NO_POST_DISPATCH, true);
    }

    protected function _isAllowed()
    {
        return true;
    }
}