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I'm looking to upgrade a Debian machine from 9 to 9.5. How can I upgrade to a specific version? Is that even possible?

shellwhale
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    To adjust the linked answer to your circumstances, run wget -q -O - https://cdimage.debian.org/mirror/cdimage/archive/9.5.0/amd64/jigdo-bd/debian-9.5.0-amd64-BD-1.jigdo | gunzip | awk -F= '/snapshot.debian.org/ {print $2}' — this gives http://snapshot.debian.org/archive/debian/20180715T102429Z/. – Stephen Kitt Feb 28 '22 at 16:32

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From the debian 9.5 release notes:

Please note that the point release does not constitute a new version of Debian 9 but only updates some of the packages included. There is no need to throw away old "stretch" media. After installation, packages can be upgraded to the current versions using an up-to-date Debian mirror. New installation images will be available soon at the regular locations.

Upgrading an existing installation to this revision can be achieved by pointing the package management system at one of Debian's many HTTP mirrors. A comprehensive list of mirrors is available at:

https://www.debian.org/mirror/list

The 9.5 release only adds updated packages to the distributed installation media.

You can simply upgrade your running system by running apt update && apt upgrade -y

mashuptwice
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    This would upgrade to 9.13, not 9.5. (I do reckon it’s best to just upgrade to the latest, but that’s not what the question is asking.) – Stephen Kitt Feb 28 '22 at 16:41