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