diff --git a/.github/workflows/navv-build-push-ghcr.yml b/.github/workflows/navv-build-push-ghcr.yml
index 967f494..5766f72 100644
--- a/.github/workflows/navv-build-push-ghcr.yml
+++ b/.github/workflows/navv-build-push-ghcr.yml
@@ -40,7 +40,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       -
         name: Build and push
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v4
         with:
           context: .
           file: ./docker/Dockerfile
diff --git a/.github/workflows/publish-to-pypi.yml b/.github/workflows/publish-to-pypi.yml
index 5770480..7c75e08 100644
--- a/.github/workflows/publish-to-pypi.yml
+++ b/.github/workflows/publish-to-pypi.yml
@@ -12,7 +12,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python 3.10
-        uses: actions/setup-python@v4.3.0
+        uses: actions/setup-python@v4.5.0
         with:
           python-version: "3.10"
       - name: Install pypa/build
diff --git a/LICENSE b/LICENSE
index 1e93898..01be9d5 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 BSD 3-Clause License
 
-© 2021 Battelle Energy Alliance, LLC
+© 2023 Battelle Energy Alliance, LLC
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
diff --git a/NOTICE b/NOTICE
index 8b77b3e..d44ec29 100644
--- a/NOTICE
+++ b/NOTICE
@@ -3,7 +3,7 @@ Github cisagov/network-architecture-verification-and-validation
 Licensed under BSD-3 License.
 
 
-© 2021 Battelle Energy Alliance, LLC
+© 2023 Battelle Energy Alliance, LLC
 ALL RIGHTS RESERVED
 
 Prepared by Battelle Energy Alliance, LLC
diff --git a/README.md b/README.md
index 3022247..949003a 100644
--- a/README.md
+++ b/README.md
@@ -255,7 +255,7 @@ See [`docker/README.md`](./docker/README.md) for setup and instructions for runn
 
 ## <a name="Footer"></a>Copyright
 
-[NAVV](https://github.com/cisagov/network-architecture-verification-and-validation) is Copyright 2021 Battelle Energy Alliance, LLC, licensed under the BSD-3 Clause License.
+[NAVV](https://github.com/cisagov/network-architecture-verification-and-validation) is Copyright 2023 Battelle Energy Alliance, LLC, licensed under the BSD-3 Clause License.
 
 See [`LICENSE`](./LICENSE) for the terms of its release.
 
diff --git a/docker/Dockerfile b/docker/Dockerfile
index b69726e..86e2d77 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,6 +1,6 @@
 FROM ubuntu:22.04
 
-# Copyright 2021 Battelle Energy Alliance, LLC
+# Copyright 2023 Battelle Energy Alliance, LLC
 
 LABEL maintainer="seth.grover@inl.gov"
 LABEL org.opencontainers.image.authors='seth.grover@inl.gov'
diff --git a/docker/README.md b/docker/README.md
index 23a6e09..299afa1 100644
--- a/docker/README.md
+++ b/docker/README.md
@@ -104,6 +104,6 @@ total 9.4M
 ```
 ## <a name="Footer"></a>Copyright
 
-[NAVV](https://github.com/cisagov/network-architecture-verification-and-validation) is Copyright 2021 Battelle Energy Alliance, LLC, licensed under the BSD-3 Clause License.
+[NAVV](https://github.com/cisagov/network-architecture-verification-and-validation) is Copyright 2023 Battelle Energy Alliance, LLC, licensed under the BSD-3 Clause License.
 
 See [`LICENSE`](./LICENSE) for the terms of its release.
\ No newline at end of file
diff --git a/docker/backup_docker.sh b/docker/backup_docker.sh
index 30279fb..71da746 100755
--- a/docker/backup_docker.sh
+++ b/docker/backup_docker.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright 2021 Battelle Energy Alliance, LLC
+# Copyright 2023 Battelle Energy Alliance, LLC
 
 set -e
 set -o pipefail
@@ -8,24 +8,30 @@ set -u
 
 ENCODING="utf-8"
 
+# image name (can be overriden via NAVV_DOCKER_IMAGE env. var.)
+NAVV_DOCKER_IMAGE="${NAVV_DOCKER_IMAGE:-ghcr.io/cisagov/network-architecture-verification-and-validation:latest}"
+# container engine (docker vs. podman, can be overriden via CONTAINER_ENGINE env. var.)
+CONTAINER_ENGINE="${CONTAINER_ENGINE:-docker}"
+
 [[ "$(uname -s)" = 'Darwin' ]] && REALPATH=grealpath || REALPATH=realpath
 [[ "$(uname -s)" = 'Darwin' ]] && DIRNAME=gdirname || DIRNAME=dirname
-if ! (type "$REALPATH" && type "$DIRNAME" && type docker) > /dev/null; then
-  echo "$(basename "${BASH_SOURCE[0]}") requires docker, $REALPATH and $DIRNAME"
+if ! (type "$REALPATH" && type "$DIRNAME" && type "$CONTAINER_ENGINE") > /dev/null; then
+  echo "$(basename "${BASH_SOURCE[0]}") requires $CONTAINER_ENGINE, $REALPATH and $DIRNAME"
   exit 1
 fi
 export SCRIPT_PATH="$($DIRNAME $($REALPATH -e "${BASH_SOURCE[0]}"))"
 
-# default docker image name (can be overriden via NAVV_DOCKER_IMAGE env. var.)
-NAVV_DOCKER_IMAGE="${NAVV_DOCKER_IMAGE:-ghcr.io/cisagov/network-architecture-verification-and-validation:latest}"
-
 # save tarball with image creation date and sha
-DOCKER_BACKUP_FILENAME=navv-docker_$(date -d "$(docker inspect --format='{{.Created}}' "$NAVV_DOCKER_IMAGE")" +"%Y%m%d_%H%M%S")_$(docker images --no-trunc --quiet "$NAVV_DOCKER_IMAGE" | cut -d: -f2 | cut -c 1-12).tar.gz
+DOCKER_BACKUP_FILENAME=navv-$CONTAINER_ENGINE-$(date -d "$($CONTAINER_ENGINE inspect --format='{{.Created}}' "$NAVV_DOCKER_IMAGE" | sed "s/ /T/" | sed "s/ +0000 UTC/Z/")" +"%Y%m%d_%H%M%S")_$($CONTAINER_ENGINE images --no-trunc --quiet "$NAVV_DOCKER_IMAGE" | cut -d: -f2 | cut -c 1-12).tar.gz
 
-# backup docker image and navv-docker.sh
-docker save "$NAVV_DOCKER_IMAGE" | gzip > "$DOCKER_BACKUP_FILENAME"
+# backup image and navv-docker.sh
+if [[ "$CONTAINER_ENGINE" == "podman" ]]; then
+  $CONTAINER_ENGINE save --format oci-archive "$NAVV_DOCKER_IMAGE" | gzip > "$DOCKER_BACKUP_FILENAME"
+else
+  $CONTAINER_ENGINE save "$NAVV_DOCKER_IMAGE" | gzip > "$DOCKER_BACKUP_FILENAME"
+fi
 [[ ! -r navv-docker.sh ]] && cp "$SCRIPT_PATH"/navv-docker.sh ./
 
 echo "Transfer $DOCKER_BACKUP_FILENAME and navv-docker.sh to destination host" | tee ./navv_export.txt
-echo "Import $NAVV_DOCKER_IMAGE with docker load -i $DOCKER_BACKUP_FILENAME" | tee -a ./navv_export.txt
+echo "Import $NAVV_DOCKER_IMAGE with $CONTAINER_ENGINE load -i $DOCKER_BACKUP_FILENAME" | tee -a ./navv_export.txt
 echo "Run with navv-docker.sh" | tee -a ./navv_export.txt
diff --git a/docker/build_docker.sh b/docker/build_docker.sh
index 43c472f..c7c4b48 100755
--- a/docker/build_docker.sh
+++ b/docker/build_docker.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright 2021 Battelle Energy Alliance, LLC
+# Copyright 2023 Battelle Energy Alliance, LLC
 
 set -e
 set -o pipefail
@@ -8,16 +8,21 @@ set -u
 
 ENCODING="utf-8"
 
+# image name (can be overriden via NAVV_DOCKER_IMAGE env. var.)
+NAVV_DOCKER_IMAGE="${NAVV_DOCKER_IMAGE:-ghcr.io/cisagov/network-architecture-verification-and-validation:latest}"
+# container engine (docker vs. podman, can be overriden via CONTAINER_ENGINE env. var.)
+CONTAINER_ENGINE="${CONTAINER_ENGINE:-docker}"
+
 [[ "$(uname -s)" = 'Darwin' ]] && REALPATH=grealpath || REALPATH=realpath
 [[ "$(uname -s)" = 'Darwin' ]] && DIRNAME=gdirname || DIRNAME=dirname
-if ! (type "$REALPATH" && type "$DIRNAME" && type docker) > /dev/null; then
-  echo "$(basename "${BASH_SOURCE[0]}") requires docker, $REALPATH and $DIRNAME"
+if ! (type "$REALPATH" && type "$DIRNAME" && type $CONTAINER_ENGINE) > /dev/null; then
+  echo "$(basename "${BASH_SOURCE[0]}") requires $CONTAINER_ENGINE, $REALPATH and $DIRNAME"
   exit 1
 fi
 export SCRIPT_PATH="$($DIRNAME $($REALPATH -e "${BASH_SOURCE[0]}"))"
 
 pushd "$SCRIPT_PATH"/.. >/dev/null 2>&1
 
-docker build -f docker/Dockerfile -t ghcr.io/cisagov/network-architecture-verification-and-validation:latest "$@" .
+$CONTAINER_ENGINE build -f docker/Dockerfile -t ghcr.io/cisagov/network-architecture-verification-and-validation:latest "$@" .
 
 popd >/dev/null 2>&1
diff --git a/docker/navv-build-for-export.sh b/docker/navv-build-for-export.sh
index 4b4706e..c419b68 100755
--- a/docker/navv-build-for-export.sh
+++ b/docker/navv-build-for-export.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright 2021 Battelle Energy Alliance, LLC
+# Copyright 2023 Battelle Energy Alliance, LLC
 
 set -o pipefail
 set -u
diff --git a/docker/navv-docker.sh b/docker/navv-docker.sh
index 5a9fce2..c066e90 100755
--- a/docker/navv-docker.sh
+++ b/docker/navv-docker.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# Copyright 2021 Battelle Energy Alliance, LLC
+# Copyright 2023 Battelle Energy Alliance, LLC
 
 # navv_docker.sh
 #
@@ -17,20 +17,29 @@ shopt -s nullglob
 
 ENCODING="utf-8"
 
-# default docker image name (can be overriden via NAVV_DOCKER_IMAGE env. var.)
+# image name (can be overriden via NAVV_DOCKER_IMAGE env. var.)
 NAVV_DOCKER_IMAGE="${NAVV_DOCKER_IMAGE:-ghcr.io/cisagov/network-architecture-verification-and-validation:latest}"
+# container engine (docker vs. podman, can be overriden via CONTAINER_ENGINE env. var.)
+CONTAINER_ENGINE="${CONTAINER_ENGINE:-docker}"
+if [[ "$CONTAINER_ENGINE" == "podman" ]]; then
+  PUID=0
+  PGID=0
+else
+  PUID=$(id -u)
+  PGID=$(id -g)
+fi
 
 # run navv -h to get help
 function print_usage() {
-  docker run --rm "$NAVV_DOCKER_IMAGE" -h | sed "s/\(optional arguments\):/\1 (use short option syntax for docker):/" >&2
+  $CONTAINER_ENGINE run --rm "$NAVV_DOCKER_IMAGE" -h | sed "s/\(options\):/\1 (use short option syntax for $CONTAINER_ENGINE):/" >&2
 }
 
 # figure out actual executable names for realpath, dirname and basename
 [[ "$(uname -s)" = 'Darwin' ]] && REALPATH=grealpath || REALPATH=realpath
 [[ "$(uname -s)" = 'Darwin' ]] && DIRNAME=gdirname || DIRNAME=dirname
 [[ "$(uname -s)" = 'Darwin' ]] && BASENAME=gbasename || BASENAME=basename
-if ! (type "$REALPATH" && type "$DIRNAME" && type "$BASENAME" && type docker) > /dev/null; then
-  echo "$(basename "${BASH_SOURCE[0]}") requires $REALPATH, $DIRNAME, $BASENAME and docker"
+if ! (type "$REALPATH" && type "$DIRNAME" && type "$BASENAME" && type $CONTAINER_ENGINE) > /dev/null; then
+  echo "$(basename "${BASH_SOURCE[0]}") requires $REALPATH, $DIRNAME, $BASENAME and $CONTAINER_ENGINE"
   exit 1
 fi
 
@@ -51,7 +60,7 @@ while getopts 'vxeho:p:z:' OPTION; do
 
     # show version and exit
     v)
-      docker run --rm \
+      $CONTAINER_ENGINE run --rm \
         -e PUID=$(id -u) -e PGID=$(id -g) \
         "$NAVV_DOCKER_IMAGE" --version ACME
       exit 0
@@ -171,9 +180,9 @@ elif [[ -r "$SCRIPT_PATH"/local.zeek ]]; then
   MOUNT_ARGS+=( "$SCRIPT_PATH/local.zeek:/opt/zeek/share/zeek/site/local.zeek:ro" )
 fi
 
-# run the navv docker image and remove it when it finishes
-docker run --rm \
-  -e PUID=$(id -u) -e PGID=$(id -g) \
+# run a navv container and remove it when it finishes
+$CONTAINER_ENGINE run --rm \
+  -e PUID=$PUID -e PGID=$PUID \
   -w /output \
   "${MOUNT_ARGS[@]}" \
   "$NAVV_DOCKER_IMAGE" \
diff --git a/src/navv/_version.py b/src/navv/_version.py
index fab2e88..3bc269f 100644
--- a/src/navv/_version.py
+++ b/src/navv/_version.py
@@ -1,2 +1,2 @@
 """This file defines the version of this module."""
-__version__ = "3.0.4"
+__version__ = "3.0.5"
diff --git a/src/navv/data_types.py b/src/navv/data_types.py
index aca6931..21fa17d 100644
--- a/src/navv/data_types.py
+++ b/src/navv/data_types.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 
-# Copyright 2021 Battelle Energy Alliance, LLC
+# Copyright 2023 Battelle Energy Alliance, LLC
 
 import netaddr
 
diff --git a/src/navv/network_analysis.py b/src/navv/network_analysis.py
index ecd85f9..58f4421 100644
--- a/src/navv/network_analysis.py
+++ b/src/navv/network_analysis.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 
-# Copyright 2021 Battelle Energy Alliance, LLC
+# Copyright 2023 Battelle Energy Alliance, LLC
 
 # python std library imports
 import argparse
diff --git a/src/navv/spreadsheet_tools.py b/src/navv/spreadsheet_tools.py
index 0302d2a..a3d9cf5 100644
--- a/src/navv/spreadsheet_tools.py
+++ b/src/navv/spreadsheet_tools.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 
-# Copyright 2021 Battelle Energy Alliance, LLC
+# Copyright 2023 Battelle Energy Alliance, LLC
 
 import os
 import itertools
diff --git a/src/navv/utilities.py b/src/navv/utilities.py
index 3715751..26619eb 100644
--- a/src/navv/utilities.py
+++ b/src/navv/utilities.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 
-# Copyright 2021 Battelle Energy Alliance, LLC
+# Copyright 2023 Battelle Energy Alliance, LLC
 
 import os
 import contextlib