Comment 1 for bug 2023529

zlib 1.2.13 was released two months before lxml 4.9.2, so the binary wheels probably picked it up. They always use the latest versions for zlib and iconv and include all library dependencies statically linked.

Note that you can always build your own lxml wheels locally, with or without statically linked libraries.

I'm assuming that this is resolved in 4.9.2.