Debian 10 (code-named "buster") and the third update Debian 9 (code-named "stretch") Twelfth update released, the two versions are mainly security issues were corrected, and for the serious problems some adjustments.
Please note that this release does not constitute a new version of Debian 10 (and Debian 9), but only updates some of the packages included therein. After installation, you can use the latest Debian mirror package will upgrade to the current version.
Debian mirror Download: https://www.debian.org/mirror/list
Detailed Description of the update, please see:
Debian 10.3：https://www.debian.org/News/2020/20200208
Debian 9.12：https://www.debian.org/News/2020/2020020802