this fixes language regr test
FROM ubuntu:16.04
-RUN apt-get update && apt-get install -y make python python-pip
+RUN apt-get update && apt-get install -y make python-dev python-pip locales curl git zlib1g-dev libffi-dev bzip2 libssl-dev
+
+RUN sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen && locale-gen
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8
+
+RUN curl -L https://github.com/pyenv/pyenv-installer/raw/master/bin/pyenv-installer | bash
+
+ENV PATH="/root/.pyenv/bin:/root/.pyenv/shims:${PATH}"
+RUN pyenv install 3.7.3
+RUN pyenv global 3.7.3
+RUN pyenv rehash
+
COPY tests/safety/requirements.txt /panda/tests/safety/requirements.txt
-RUN pip install -r /panda/tests/safety/requirements.txt
COPY . /panda
