Dns service not running after update

after updating my pihole running on my Raspberry pi 3b it stops running

Expected Behaviour:

dns start

Actual Behaviour:

red dot on dashboard

Debug Token:

https://tricorder.pi-hole.net/GzJrIiO6/

Your debug log shows a rather old pihole-FTL:

*** [ DIAGNOSING ]: FTL version
[✓] FTL: v4.3.1 (https://discourse.pi-hole.net/t/how-do-i-update-pi-hole/249)

What Pi-hole version did you update from?

*** [ DIAGNOSING ]: Core version
[i] Core: v5.17.1 (https://discourse.pi-hole.net/t/how-do-i-update-pi-hole/249)

*** [ DIAGNOSING ]: Web version
[i] Web: v5.20.1 (https://discourse.pi-hole.net/t/how-do-i-update-pi-hole/249)

*** [ DIAGNOSING ]: FTL version
[✓] FTL: v4.3.1 (https://discourse.pi-hole.net/t/how-do-i-update-pi-hole/249)

Your FTL was not updated.

Now you have the latest Pi-hole core, but a very old v4 FTL.

Try to update again.

thanks for reply, if i try to update it by "sudo pihole -up" it says that "it's impossible to find php7-3intl

not sure about version, but very old (2 or 3 years old)

You're running an rather old OS that has reached EOL. Consider installing a more recent one

*** [ DIAGNOSING ]: Operating system
[✓] Raspbian GNU/Linux 10 (buster)

Thanks folks, you were right!
After uograding to pi os and reinstall piHole everything works fine!
Thanks!

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