MediaWiki composer.json has "wikimedia/ip-set": "1.0.1" but the IPSet.git project lacks tag making it hard to figure out which code is actually in use.
The packagist page https://packagist.org/packages/wikimedia/ip-set has 1.0 and 1.0.1 listed. I am not sure how from where they come from. The IPSet composer.json does not have any version indication.