Requirement idna was added in 181c12ae04ba but I don't know why. This package is not directly used by searxng but its a sub-requirement of some other packages using package `requests` (with different range of supported versions, see below). In summary one can say: the version of idna should be depend on package `requests`:: ... Pallets-Sphinx-Themes==1.2.3 ... - Sphinx [required: Any, installed: 3.5.4] ... - requests [required: >=2.5.0, installed: 2.25.1] ... - idna [required: >=2.5,<3, installed: 2.10] ... ... transifex-client==0.14.2 - requests [required: >=2.19.1,<3.0.0, installed: 2.25.1] ... - idna [required: >=2.5,<3, installed: 2.10] twine==3.4.1 ... - requests [required: >=2.20, installed: 2.25.1] ... - idna [required: >=2.5,<3, installed: 2.10] Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>