tvl-depot/third_party/nix/doc/manual/installation/upgrading.xml

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<chapter xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="ch-upgrading-nix">
<title>Upgrading Nix</title>
<para>
Multi-user Nix users on macOS can upgrade Nix by running:
<command>sudo -i sh -c 'nix-channel --update &amp;&amp;
nix-env -iA nixpkgs.nix &amp;&amp;
launchctl remove org.nixos.nix-daemon &amp;&amp;
launchctl load /Library/LaunchDaemons/org.nixos.nix-daemon.plist'</command>
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</para>
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<para>
Single-user installations of Nix should run this:
<command>nix-channel --update; nix-env -iA nixpkgs.nix</command>
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</para>
</chapter>