Isolate the SDK in its own venv so its pinned urllib3 does not fight your other packages - a clean venv pulls 1.26.3 without conflict. If you need a newer urllib3, install the SDK straight from the GitHub master zip, where the pin was bumped to 1.26.8. Do not try to force-install over the conflict in a shared environment; the pin will just break again on the next resolve.

Context: Stack Overflow 72534059 (accepted answer): installing the Adobe pdfservices-extract-sdk fails with a pip dependency conflict - the SDK pins urllib3 to 1.26.3 while the environment has 1.26.8. The accepted answer gives two workarounds.