python-anticaptcha is in an unsupported or invalid wheel

While using pip3 - I get the following error with the latest version of python-anticaptcha 0.4.1 on Ubuntu 16.04

You are using pip version 8.1.1, however version 19.2.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
The command '/bin/sh -c /usr/bin/pip3 install python-anticaptcha==0.4.1' returned a non-zero code: 1

You can reproduce this with docker using Dockerfile:

FROM ubuntu:16.04
WORKDIR .
USER root
RUN apt-get update -y

RUN apt-get install -y python python3-pip
RUN /usr/bin/pip3 install python-anticaptcha==0.4.1

I know I am using an older version of pip, but I am not willing to upgrade at the moment

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Did you tried build again after pull?

Could you try pip install python-anticaptcha --no-binary python-anticaptcha to avoid wheel (no real benefits, because our library don’t have any binaries)?

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In my situation pip version was too old.

The above-mentioned Dockerfile also has a problem that it installs two versions of Python, which is not recommended for containers. Could somebody verify following Dockerfile?

FROM ubuntu:16.04
WORKDIR .
USER root
RUN apt-get update -y

RUN apt-get install -y python3 && \
    apt-get install -y curl && \
    curl -s -o /opt/get-pip.py https://bootstrap.pypa.io/get-pip.py && \
    python3 /opt/get-pip.py && \
    rm /opt/get-pip.py
RUN pip3 install python-anticaptcha==0.4.1