anchor.diff: -FROM ruby:2.4.1
  +FROM ruby:2.5
   
   RUN printf "deb http://deb.debian.org/debian testing main\ndeb http://deb.debian.org/debian testing-updates main\ndeb http://security.debian.org testing/updates main" >> /etc/apt/sources.list
   RUN apt-get update && \
  -    apt-get install --yes --no-install-recommends apt-transport-https=1.0.* && \
  +    apt-get install --yes --no-install-recommends apt-transport-https && \
       apt-get clean && \
       rm -rf /var/lib/apt/lists/*
   RUN echo 'deb https://deb.nodesource.com/node_6.x jessie main' > /etc/apt/sources.list.d/nodesource.list && \
       curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add - && \
       apt-get update && \
  -    apt-get install --yes --target-release=jessie --no-install-recommends python-pip python-yaml locales nodejs=6.* build-essential && \
  -    apt-get install --yes --target-release=testing --no-install-recommends git python-sphinx && \
  +    apt-get install --yes --target-release=jessie --no-install-recommends build-essential git locales nodejs python-pip python-setuptools python-sphinx python-yaml && \
       apt-get clean && \
       rm -rf /var/lib/apt/lists/*
   RUN gem update --no-document --system
  
positive.code: RUN locale-gen
  ENV LC_ALL en_US.UTF-8
  
  RUN curl -o /tmp/chefdk.deb https://packages.chef.io/files/stable/chefdk/1.3.43/debian/8/chefdk_1.3.43-1_amd64.deb && \
      dpkg -i /tmp/chefdk.deb && \
      rm -rf /tmp/chefdk.deb
  
  
negative.code: RUN mkdir -p "$APP_HOME"
  
  RUN gem install bundler
  RUN pip install yamllint
  
  WORKDIR $APP_HOME
  
  