How to use in environment variable in packages.config?

I have a class library project in C#

I want to set version of a nuget package by environment variable.

I've tried this:

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Package" version="%version%" targetFramework="net48" />
</packages>

but I'm getting error

packages.config': Invalid package version for package id

How can I set the version by some variable? Thank you.