Update tox version in Dockerfile.
@@ -49,7 +49,7 @@ RUN set -e && \
RUN python3 -m pip install --upgrade pip
RUN set -e && \
- python3 -m pip install --no-cache-dir "tox==3.14.2"
+ python3 -m pip install --no-cache-dir "tox==3.20.1"
COPY . /libcloud
