anchor.diff:  
   #install rsession proxy
   RUN pip install --no-cache-dir \
  -        jupyter-rsession-proxy==1.2
  +        jupyter-rsession-proxy==2.0.1
   
   # Install IRKernel
  -RUN r -e "install.packages('IRkernel', version='1.1.1')" && \
  +RUN r -e "install.packages('IRkernel', version='1.2')" && \
       r -e "IRkernel::installspec(prefix='${CONDA_DIR}')"
   
   # Install R packages, cleanup temp package download location
  
positive.code: # Install R packages
  # Our pre-built R packages from rspm are built against system libs in focal
  # rstan takes forever to compile from source, and needs libnodejs
  # We don't want R 4.1 yet - the graphics protocol version it has is incompatible
  # with the version of RStudio we use. So we pin R to 4.0.5
  # Our pre-built R packages from rspm are built against system libs in focal
  # rstan takes forever to compile from source, and needs libnodejs
  # So we install older (10.x) nodejs from apt rather than newer from conda
  ENV R_VERSION=4.0.5-1.2004.0
  RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9
  RUN echo "deb https://cloud.r-project.org/bin/linux/ubuntu focal-cran40/" > /etc/apt/sources.list.d/cran.list
  RUN apt-get update -qq --yes > /dev/null && \
      apt-get install --yes -qq \
      r-base-core=${R_VERSION} \
      r-base-dev=${R_VERSION} \
      r-cran-littler=0.3.11-1.2004.0 \
      libglpk-dev \
      libzmq5 \
      nodejs npm > /dev/null
  
negative.code:         lsb-release \
          libclang-dev  > /dev/null
  
  ENV RSTUDIO_URL https://download2.rstudio.org/server/bionic/amd64/rstudio-server-2021.09.1-372-amd64.deb
  RUN curl --silent --location --fail ${RSTUDIO_URL} > /tmp/rstudio.deb && \
      dpkg -i /tmp/rstudio.deb && \
      rm /tmp/rstudio.deb
  