diff --git a/base-notebook/Dockerfile b/base-notebook/Dockerfile
index 97581c23..0cf7cef5 100644
--- a/base-notebook/Dockerfile
+++ b/base-notebook/Dockerfile
@@ -4,7 +4,7 @@
 # Ubuntu 20.04 (focal)
 # https://hub.docker.com/_/ubuntu/?tab=tags&name=focal
 # OS/ARCH: linux/amd64
-ARG ROOT_CONTAINER=ubuntu:focal-20200703@sha256:d5a6519d9f048100123c568eb83f7ef5bfcad69b01424f420f17c932b00dea76
+ARG ROOT_CONTAINER=ubuntu:focal-20200729@sha256:6f2fb2f9fb5582f8b587837afd6ea8f37d8d1d9e41168c90f410a6ef15fa8ce5
 
 ARG BASE_CONTAINER=$ROOT_CONTAINER
 FROM $BASE_CONTAINER
@@ -114,9 +114,9 @@ RUN conda install --quiet --yes 'tini=0.18.0' && \
 # Do all this in a single RUN command to avoid duplicating all of the
 # files across image layers when the permissions change
 RUN conda install --quiet --yes \
-    'notebook=6.1.3' \
+    'notebook=6.1.4' \
     'jupyterhub=1.1.0' \
-    'jupyterlab=2.2.5' && \
+    'jupyterlab=2.2.7' && \
     conda clean --all -f -y && \
     npm cache clean --force && \
     jupyter notebook --generate-config && \
diff --git a/datascience-notebook/Dockerfile b/datascience-notebook/Dockerfile
index eb47e705..e711551d 100644
--- a/datascience-notebook/Dockerfile
+++ b/datascience-notebook/Dockerfile
@@ -14,6 +14,14 @@ SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
 USER root
 
+# Julia installation
+# Default values can be overridden at build time
+# (ARGS are in lower case to distinguish them from ENV)
+# Check https://julialang.org/downloads/
+ARG julia_version="1.5.1"
+# SHA256 checksum
+ARG julia_checksum="f5d37cb7fe40e3a730f721da8f7be40310f133220220949939d8f892ce2e86e3"
+
 # R pre-requisites
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
@@ -24,16 +32,16 @@ RUN apt-get update && \
 
 # Julia dependencies
 # install Julia packages in /opt/julia instead of $HOME
-ENV JULIA_DEPOT_PATH=/opt/julia
-ENV JULIA_PKGDIR=/opt/julia
-ENV JULIA_VERSION=1.5.0
+ENV JULIA_DEPOT_PATH=/opt/julia \
+    JULIA_PKGDIR=/opt/julia \
+    JULIA_VERSION="${julia_version}"
 
 WORKDIR /tmp
 
 # hadolint ignore=SC2046
 RUN mkdir "/opt/julia-${JULIA_VERSION}" && \
     wget -q https://julialang-s3.julialang.org/bin/linux/x64/$(echo "${JULIA_VERSION}" | cut -d. -f 1,2)"/julia-${JULIA_VERSION}-linux-x86_64.tar.gz" && \
-    echo "be7af676f8474afce098861275d28a0eb8a4ece3f83a11027e3554dcdecddb91 *julia-${JULIA_VERSION}-linux-x86_64.tar.gz" | sha256sum -c - && \
+    echo "${julia_checksum} *julia-${JULIA_VERSION}-linux-x86_64.tar.gz" | sha256sum -c - && \
     tar xzf "julia-${JULIA_VERSION}-linux-x86_64.tar.gz" -C "/opt/julia-${JULIA_VERSION}" --strip-components=1 && \
     rm "/tmp/julia-${JULIA_VERSION}-linux-x86_64.tar.gz"
 RUN ln -fs /opt/julia-*/bin/julia /usr/local/bin/julia
@@ -50,13 +58,13 @@ USER $NB_UID
 
 # R packages including IRKernel which gets installed globally.
 RUN conda install --quiet --yes \
-    'r-base=3.6.3' \
+    'r-base=4.0.2' \
     'r-caret=6.0*' \
     'r-crayon=1.3*' \
     'r-devtools=2.3*' \
-    'r-forecast=8.12*' \
+    'r-forecast=8.13*' \
     'r-hexbin=1.28*' \
-    'r-htmltools=0.4*' \
+    'r-htmltools=0.5*' \
     'r-htmlwidgets=1.5*' \
     'r-irkernel=1.1*' \
     'r-nycflights13=1.0*' \
@@ -64,11 +72,11 @@ RUN conda install --quiet --yes \
     'r-randomforest=4.6*' \
     'r-rcurl=1.98*' \
     'r-reshape2=1.4*' \
-    'r-rmarkdown=2.1*' \
+    'r-rmarkdown=2.3*' \
     'r-rsqlite=2.2*' \
-    'r-shiny=1.4*' \
+    'r-shiny=1.5*' \
     'r-tidyverse=1.3*' \
-    'rpy2=3.1*' \
+    'rpy2=3.3*' \
     && \
     conda clean --all -f -y && \
     fix-permissions "${CONDA_DIR}" && \
diff --git a/r-notebook/Dockerfile b/r-notebook/Dockerfile
index f454c931..53f0c1af 100644
--- a/r-notebook/Dockerfile
+++ b/r-notebook/Dockerfile
@@ -25,22 +25,22 @@ USER $NB_UID
 
 # R packages
 RUN conda install --quiet --yes \
-    'r-base=4.0.0' \
+    'r-base=4.0.2' \
     'r-caret=6.*' \
     'r-crayon=1.3*' \
     'r-devtools=2.3*' \
-    'r-forecast=8.12*' \
+    'r-forecast=8.13*' \
     'r-hexbin=1.28*' \
-    'r-htmltools=0.4*' \
+    'r-htmltools=0.5*' \
     'r-htmlwidgets=1.5*' \
     'r-irkernel=1.1*' \
     'r-nycflights13=1.0*' \
     'r-randomforest=4.6*' \
     'r-rcurl=1.98*' \
-    'r-rmarkdown=2.2*' \
+    'r-rmarkdown=2.3*' \
     'r-rodbc=1.3*' \
     'r-rsqlite=2.2*' \
-    'r-shiny=1.4*' \
+    'r-shiny=1.5*' \
     'r-tidyverse=1.3*' \
     'unixodbc=2.3.*' \
     'r-tidymodels=0.1*' \
diff --git a/scipy-notebook/Dockerfile b/scipy-notebook/Dockerfile
index 0801a1e9..347ac7e3 100644
--- a/scipy-notebook/Dockerfile
+++ b/scipy-notebook/Dockerfile
@@ -18,30 +18,31 @@ USER $NB_UID
 RUN conda install --quiet --yes \
     'beautifulsoup4=4.9.*' \
     'conda-forge::blas=*=openblas' \
-    'bokeh=2.1.*' \
+    'bokeh=2.2.*' \
     'bottleneck=1.3.*' \
-    'cloudpickle=1.5.*' \
+    'cloudpickle=1.6.*' \
     'cython=0.29.*' \
-    'dask=2.20.*' \
+    'dask=2.26.*' \
     'dill=0.3.*' \
     'h5py=2.10.*' \
+    # hdf5 update to > 1.10 fails resolving deps
     'hdf5=1.10.*' \
     'ipywidgets=7.5.*' \
     'ipympl=0.5.*'\
-    'matplotlib-base=3.2.*' \
-    # numba update to 0.49 fails resolving deps.
+    'matplotlib-base=3.3.*' \
+    # numba update to > 0.49 fails resolving deps
     'numba=0.48.*' \
     'numexpr=2.7.*' \
     'pandas=1.1.*' \
     'patsy=0.5.*' \
-    'protobuf=3.12.*' \
+    'protobuf=3.13.*' \
     'pytables=3.6.*' \
     'scikit-image=0.17.*' \
     'scikit-learn=0.23.*' \
     'scipy=1.5.*' \
-    'seaborn=0.10.*' \
+    'seaborn=0.11.*' \
     'sqlalchemy=1.3.*' \
-    'statsmodels=0.11.*' \
+    'statsmodels=0.12.*' \
     'sympy=1.6.*' \
     'vincent=0.4.*' \
     'widgetsnbextension=3.5.*'\
diff --git a/tensorflow-notebook/Dockerfile b/tensorflow-notebook/Dockerfile
index 4533fbc6..02da4efb 100644
--- a/tensorflow-notebook/Dockerfile
+++ b/tensorflow-notebook/Dockerfile
@@ -7,6 +7,6 @@ LABEL maintainer="Jupyter Project <jupyter@googlegroups.com>"
 
 # Install Tensorflow
 RUN pip install --quiet --no-cache-dir \
-    'tensorflow==2.2.0' && \
+    'tensorflow==2.3.0' && \
     fix-permissions "${CONDA_DIR}" && \
     fix-permissions "/home/${NB_USER}"