The current version of Debian is known as Buster and is version 10. All Debian releases are named after characters in the Pixar film Toy Story.
Debian spokeswoman Laura Arjona Reina said in a statement that after this release, Debian's Security and Release Teams would no longer offer updates for Debian 9.
Users who wanted to continue to receive security support should upgrade to Debian 10, or see this site for details about the subset of architectures and packages covered by the long-term support project, she said.
She said people who frequently installed updates from security.debian.org would not have to update many packages, and most such updates were included in the point release.
New installation images would be available soon at the regular locations, she noted..
"Upgrading an existing installation to this revision can be achieved by pointing the package management system at one of Debian's many HTTP mirrors," Arjona Reina added..