Upgrading Nix
Note
These upgrade instructions apply where Nix was installed following the installation instructions in this manual.
Check which Nix version will be installed, for example from one of the release channels such as nixpkgs-unstable
:
$ nix-shell -p nix -I nixpkgs=channel:nixpkgs-unstable --run "nix --version"
nix (Nix) 2.18.1
Warning
Writing to the local store with a newer version of Nix, for example by building derivations with
nix-build
ornix-store --realise
, may change the database schema! Reverting to an older version of Nix may therefore require purging the store database before it can be used.
Linux multi-user
$ sudo su
# nix-env --install --file '<nixpkgs>' --attr nix cacert -I nixpkgs=channel:nixpkgs-unstable
# systemctl daemon-reload
# systemctl restart nix-daemon
macOS multi-user
$ sudo nix-env --install --file '<nixpkgs>' --attr nix -I nixpkgs=channel:nixpkgs-unstable
$ sudo launchctl remove org.nixos.nix-daemon
$ sudo launchctl load /Library/LaunchDaemons/org.nixos.nix-daemon.plist
Single-user all platforms
$ nix-env --install --file '<nixpkgs>' --attr nix cacert -I nixpkgs=channel:nixpkgs-unstable