diff --git a/R-minimal/Dockerfile b/R-minimal/Dockerfile
index 358214f..6a746df 100644
--- a/R-minimal/Dockerfile
+++ b/R-minimal/Dockerfile
@@ -1,23 +1,23 @@
-FROM renku/singleuser-r:0.4.3-renku0.8.2
+FROM renku/singleuser-r:0.4.4-renku0.9.0
 
 # Uncomment and adapt if code is to be included in the image
 # COPY src /code/src
 
 # Uncomment and adapt if your R or python packages require extra linux (ubuntu) software
 # e.g. the following installs apt-utils and vim; each pkg on its own line, all lines
 # except for the last end with backslash '\' to continue the RUN line
-# 
+#
 # USER root
 # RUN apt-get update && \
 #    apt-get install -y --no-install-recommends \
 #    apt-utils \
 #    vim
 # USER ${NB_USER}
 
 # install the R dependencies
 COPY install.R /tmp/
 RUN R -f /tmp/install.R
 
 # install the python dependencies
 COPY requirements.txt /tmp/
 RUN pip3 install -r /tmp/requirements.txt
diff --git a/python-minimal/Dockerfile b/python-minimal/Dockerfile
index 4d4a15b..1c7748c 100644
--- a/python-minimal/Dockerfile
+++ b/python-minimal/Dockerfile
@@ -1,22 +1,22 @@
-FROM renku/singleuser:0.4.3-renku0.8.2
+FROM renku/singleuser:0.4.4-renku0.9.0
 
 # Uncomment and adapt if code is to be included in the image
 # COPY src /code/src
 
 # Uncomment and adapt if your R or python packages require extra linux (ubuntu) software
 # e.g. the following installs apt-utils and vim; each pkg on its own line, all lines
 # except for the last end with backslash '\' to continue the RUN line
-# 
+#
 # USER root
 # RUN apt-get update && \
 #    apt-get install -y --no-install-recommends \
 #    apt-utils \
 #    vim
 # USER ${NB_USER}
 
 # install the python dependencies
 COPY requirements.txt environment.yml /tmp/
 RUN conda env update -q -f /tmp/environment.yml && \
     /opt/conda/bin/pip install -r /tmp/requirements.txt && \
     conda clean -y --all && \
     conda env export -n "root"