Mostafa Shahverdy wrote: > I believe unstable was `buster` and my current installed packages are > from `buster`. I know that most my packages are ahead, but what about > like 10 month from now that `buster` becomes stable? cat /etc/debian_version 9.1 is stretch I would suggest keep the name buster in apt/source - it will not make difference when it will become stable. Do regular apt-get update/upgrade. regards