Hi, Today pip 20.3 is released[1] and jobs started failing during keystone install in devstack with: 2020-11-30 15:14:31.117 | + inc/python:pip_install:193 : sudo -H LC_ALL=en_US.UTF-8 SETUPTOOLS_USE_DISTUTILS=stdlib http_proxy= https_proxy= no_proxy= PIP_FIND_LINKS= SETUPTOOLS_SYS_PATH_TECHNIQUE=rewrite python3.6 -m pip install -c /opt/stack/old/requirements/upper-constraints.txt -e /opt/stack/old/neutron 2020-11-30 15:14:32.271 | Looking in indexes: https://mirror.gra1.ovh.opendev.org/pypi/simple, https://mirror.gra1.ovh.opendev.org/wheel/ubuntu-18.04-x86_64 2020-11-30 15:14:32.272 | DEPRECATION: Constraints are only allowed to take the form of a package name and a version specifier. Other forms were originally permitted as an accident of the implementation, but were undocumented. The new implementation of the resolver no longer supports these forms. A possible replacement is replacing the constraint with a requirement.. You can find discussion regarding this at https://github.com/pypa/pip/issues/8210. 2020-11-30 15:14:32.272 | ERROR: Links are not allowed as constraints Logstash signature: [2] It seems not all the jobs are effected but at least grenade on master is hit [3]. It seems that passing jobs are using pip from the base image instead of installing a fresh one from pypi. As a first glance the change "Flip the switch on new resolver"[4] seem to be related. Cheers, gibi [1] https://pip.pypa.io/en/stable/news/#id1 [2] http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A... [3] https://zuul.opendev.org/t/openstack/builds?job_name=grenade&branch=master [4] https://github.com/pypa/pip/pull/9019