lix/src/nix/profile-upgrade.md

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R""(
**Note**: unlike [`nix profile install`](./nix3-profile-install.md), this command does *not* take installables.
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# Examples
* Upgrade all packages that were installed using an unlocked flake
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reference:
```console
# nix profile upgrade '.*'
```
* Upgrade a specific package by name:
```console
# nix profile upgrade hello
```
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```console
# nix profile upgrade packages.x86_64-linux.hello
```
# Description
This command upgrades a previously installed package in a Nix profile,
by fetching and evaluating the latest version of the flake from which
the package was installed.
> **Warning**
>
> This only works if you used an *unlocked* flake reference at
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> installation time, e.g. `nixpkgs#hello`. It does not work if you
> used a *locked* flake reference
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> (e.g. `github:NixOS/nixpkgs/13d0c311e3ae923a00f734b43fd1d35b47d8943a#hello`),
> since in that case the "latest version" is always the same.
)""