Unable to upgrade

Hey. I can’t update, here’s what comes out of the terminal:

user@host:~$ sudo apt-get-update-plus dist-upgrade

Hit:3 https://deb.whonix.org stretch InRelease
Get:1 https://cdn-aws.deb.debian.org/debian-security stretch/updates InRelease [94.3 kB]
Ign:2 https://cdn-aws.deb.debian.org/debian stretch InRelease
Get:5 https://cdn-aws.deb.debian.org/debian-security stretch/updates/main amd64 Packages [497 kB]
Get:6 https://cdn-aws.deb.debian.org/debian-security stretch/updates/main Translation-en [219 kB]
Hit:4 https://cdn-aws.deb.debian.org/debian stretch Release
Reading package lists…
E: Release file for https://deb.whonix.org/dists/stretch/InRelease is expired (invalid since 19d 1h 44min 0s). Updates for this repository will not be applied.

help me

Whonix 14 (stretch based) is deprecated. Please upgrade to Whonix 15. Original announcement: