This new version is based on TYPO3 CMS 9LTS. We will continue to maintain the TYPO3 CMS8 (Yoast SEO for TYPO3 v3.x) and CMS 9 (Yoast SEO for TYPO3 v4.x) compatible version with maintenance and new features. The support for CMS 7 (Yoast SEO for TYPO3 v3.0.