diff --git a/Makefile b/Makefile
index 02b3010ab1..d3dc3c36d3 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@ ALL_IMAGES:=$(ALL_STACKS)
 
 # Dockerfile Linter
 HADOLINT="${HOME}/hadolint"
-HADOLINT_VERSION="v1.23.0"
+HADOLINT_VERSION="v2.1.0"
 
 # Enable BuildKit for Docker build
 export DOCKER_BUILDKIT:=1
diff --git a/base-notebook/Dockerfile b/base-notebook/Dockerfile
index 211d379b3d..f5fcd138b2 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-20210217@sha256:e3d7ff9efd8431d9ef39a144c45992df5502c995b9ba3c53ff70c5b52a848d9c
+ARG ROOT_CONTAINER=ubuntu:focal-20210401@sha256:5403064f94b617f7975a19ba4d1a1299fd584397f6ee4393d0e16744ed11aab1
 
 ARG BASE_CONTAINER=$ROOT_CONTAINER
 FROM $BASE_CONTAINER
@@ -24,9 +24,9 @@ USER root
 # (ARGS are in lower case to distinguish them from ENV)
 # Check https://github.com/conda-forge/miniforge/releases
 # Conda version
-ARG conda_version="4.9.2"
+ARG conda_version="4.10.0"
 # Miniforge installer patch version
-ARG miniforge_patch_number="7"
+ARG miniforge_patch_number="0"
 # Miniforge installer architecture
 ARG miniforge_arch="x86_64"
 # Package Manager and Python implementation to use (https://github.com/conda-forge/miniforge)
@@ -39,7 +39,7 @@ ARG miniforge_version="${conda_version}-${miniforge_patch_number}"
 # Miniforge installer
 ARG miniforge_installer="${miniforge_python}-${miniforge_version}-Linux-${miniforge_arch}.sh"
 # Miniforge checksum
-ARG miniforge_checksum="5a827a62d98ba2217796a9dc7673380257ed7c161017565fba8ce785fb21a599"
+ARG miniforge_checksum="c56cc2da96043688c6bdb521d825de27754de0a342d5228ba3155cd94532ff75"
 
 # Install all OS dependencies for notebook server that starts but lacks all
 # features (e.g., download as all possible file formats)
@@ -132,7 +132,7 @@ RUN wget --quiet "https://github.com/conda-forge/miniforge/releases/download/${m
 # 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=6.2.0' \
+    'notebook=6.3.0' \
     'jupyterhub=1.3.0' \
     'jupyterlab=3.0.12' && \
     conda clean --all -f -y && \
diff --git a/datascience-notebook/Dockerfile b/datascience-notebook/Dockerfile
index 3daa993de9..24a0133c7d 100644
--- a/datascience-notebook/Dockerfile
+++ b/datascience-notebook/Dockerfile
@@ -18,9 +18,9 @@ USER root
 # 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="1.5.4"
+ARG julia_version="1.6.0"
 # SHA256 checksum
-ARG julia_checksum="80dec351d1a593e8ad152636971a48d0c81bfcfab92c87f3604663616f1e8bc5"
+ARG julia_checksum="463b71dc70ca7094c0e0fd6d55d130051a7901e8dec5eb44d6002c57d1bd8585"
 
 # R pre-requisites
 RUN apt-get update && \
@@ -61,7 +61,7 @@ RUN conda install --quiet --yes \
     'r-base=4.0.3'  \
     'r-caret=6.0*' \
     'r-crayon=1.4*' \
-    'r-devtools=2.3*' \
+    'r-devtools=2.4*' \
     'r-forecast=8.14*' \ 
     'r-hexbin=1.28*' \
     'r-htmltools=0.5*' \
diff --git a/r-notebook/Dockerfile b/r-notebook/Dockerfile
index 4193fbd622..5b5e7b592a 100644
--- a/r-notebook/Dockerfile
+++ b/r-notebook/Dockerfile
@@ -28,7 +28,7 @@ RUN conda install --quiet --yes \
     'r-base=4.0.3' \
     'r-caret=6.*' \
     'r-crayon=1.4*' \
-    'r-devtools=2.3*' \
+    'r-devtools=2.4*' \
     'r-forecast=8.14*' \
     'r-hexbin=1.28*' \
     'r-htmltools=0.5*' \
diff --git a/scipy-notebook/Dockerfile b/scipy-notebook/Dockerfile
index 64b0e8d67a..dd91267066 100644
--- a/scipy-notebook/Dockerfile
+++ b/scipy-notebook/Dockerfile
@@ -22,12 +22,12 @@ RUN conda install --quiet --yes \
     'bottleneck=1.3.*' \
     'cloudpickle=1.6.*' \
     'cython=0.29.*' \
-    'dask=2021.3.*' \
+    'dask=2021.4.*' \
     'dill=0.3.*' \
     'h5py=3.1.*' \
     'ipywidgets=7.6.*' \
-    'ipympl=0.6.*'\
-    'matplotlib-base=3.3.*' \
+    'ipympl=0.7.*'\
+    'matplotlib-base=3.4.*' \
     'numba=0.53.*' \
     'numexpr=2.7.*' \
     'pandas=1.2.*' \