COPY requirements.txt /
-RUN pip install --upgrade pip
-RUN pip install --no-use-pep517 -r /requirements.txt
+RUN apk add --no-cache --virtual build_dependencies openssl-dev gcc libffi-dev musl-dev linux-headers python3-dev
+
+RUN apk add --no-cache libxml2-dev libxslt-dev \
+ && pip install --upgrade pip \
+ && pip install -r /requirements.txt
+
+RUN apk del build_dependencies
RUN adduser -D vvpuser
USER vvpuser