First, ensure that pip is on the latest version
sudo python3 -m pip install pip --upgrade
Could you then try
sudo python3 -m pip install pendulum==2.1.1
and then
sudo python3 -m pip install pendulum --upgrade
First, ensure that pip is on the latest version
sudo python3 -m pip install pip --upgrade
Could you then try
sudo python3 -m pip install pendulum==2.1.1
and then
sudo python3 -m pip install pendulum --upgrade