diff --git a/.github/workflows/pytest-with-coverage.yaml b/.github/workflows/pytest-with-coverage.yaml
index 421f3a7..3c6d362 100644
--- a/.github/workflows/pytest-with-coverage.yaml
+++ b/.github/workflows/pytest-with-coverage.yaml
@@ -3,6 +3,9 @@ name: pytest-with-coverage
 on:
   push:
     branches: [ '*' ]
+  # Enable workflow to be triggered from GitHub CLI, browser, or via API
+  # primarily for testing conda env solution for new Python versions
+  workflow_dispatch:
 
 jobs:
   pytest-with-coverage:
@@ -12,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ '3.10', '3.11' ]
+        python-version: [ '3.11', '3.12' ]
     uses: UBC-MOAD/gha-workflows/.github/workflows/pytest-with-coverage.yaml@main
     with:
       python-version: ${{ matrix.python-version }}
diff --git a/.github/workflows/sphinx-linkcheck.yaml b/.github/workflows/sphinx-linkcheck.yaml
index 7c8f673..cae7dad 100644
--- a/.github/workflows/sphinx-linkcheck.yaml
+++ b/.github/workflows/sphinx-linkcheck.yaml
@@ -15,7 +15,7 @@ jobs:
       matrix:
         # Need to specify Python version here because we use test env which gets its
         # Python version via matrix
-        python-version: [ '3.11' ]
+        python-version: [ '3.12' ]
     uses: UBC-MOAD/gha-workflows/.github/workflows/sphinx-linkcheck.yaml@main
     with:
       python-version: ${{ matrix.python-version }}
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index bedc4c1..fd06ea5 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -16,6 +16,6 @@ repos:
       - id: check-added-large-files
   # Code formatting with black
   - repo: https://github.com/psf/black
-    rev: 23.10.1
+    rev: 23.11.0
     hooks:
       - id: black
diff --git a/README.rst b/README.rst
index 96c7da4..d36051a 100644
--- a/README.rst
+++ b/README.rst
@@ -5,8 +5,8 @@ SalishSeaCast NEMO Command Processor
 .. image:: https://img.shields.io/badge/license-Apache%202-cb2533.svg
     :target: https://www.apache.org/licenses/LICENSE-2.0
     :alt: Licensed under the Apache License, Version 2.0
-.. image:: https://img.shields.io/badge/Python-3.10%20%7C%203.11-blue?logo=python&label=Python&logoColor=gold
-    :target: https://docs.python.org/3.11/
+.. image:: https://img.shields.io/badge/Python-3.11%20%7C%203.12-blue?logo=python&label=Python&logoColor=gold
+    :target: https://docs.python.org/3.12/
     :alt: Python Version
 .. image:: https://img.shields.io/badge/version%20control-git-blue.svg?logo=github
     :target: https://github.com/SalishSeaCast/SalishSeaCmd
diff --git a/docs/breaking_changes.rst b/docs/breaking_changes.rst
index 5c84600..60d38f4 100644
--- a/docs/breaking_changes.rst
+++ b/docs/breaking_changes.rst
@@ -22,6 +22,18 @@
 ``SalishSeaCmd`` Changes That Break Backward Compatibility
 *************************************************************
 
+.. _BreakingChangesVersion23.1:
+
+Version 23.1
+============
+
+The following change that was introduced in version 23.1 of the ``SalishSeaCmd``
+package is incompatible with earlier versions:
+
+* Drop support for Python 3.10.
+  Minimum supported Python version is now 3.11.
+
+
 .. _BreakingChangesVersion22.3:
 
 Version 22.3
diff --git a/docs/development.rst b/docs/development.rst
index b49177c..161b550 100644
--- a/docs/development.rst
+++ b/docs/development.rst
@@ -25,8 +25,8 @@
 .. image:: https://img.shields.io/badge/license-Apache%202-cb2533.svg
     :target: https://www.apache.org/licenses/LICENSE-2.0
     :alt: Licensed under the Apache License, Version 2.0
-.. image:: https://img.shields.io/badge/Python-3.10%20%7C%203.11-blue?logo=python&label=Python&logoColor=gold
-    :target: https://docs.python.org/3.11/
+.. image:: https://img.shields.io/badge/Python-3.11%20%7C%203.12-blue?logo=python&label=Python&logoColor=gold
+    :target: https://docs.python.org/3.12/
     :alt: Python Version
 .. image:: https://img.shields.io/badge/version%20control-git-blue.svg?logo=github
     :target: https://github.com/SalishSeaCast/SalishSeaCmd
@@ -65,14 +65,14 @@
 Python Versions
 ===============
 
-.. image:: https://img.shields.io/badge/Python-3.10%20%7C%203.11-blue?logo=python&label=Python&logoColor=gold
-    :target: https://docs.python.org/3.11/
+.. image:: https://img.shields.io/badge/Python-3.11%20%7C%203.12-blue?logo=python&label=Python&logoColor=gold
+    :target: https://docs.python.org/3.12/
     :alt: Python Version
 
-The :kbd:`SalishSeaCmd` package is developed using `Python`_ 3.11.
-The minimum supported Python version is 3.10.
+The :kbd:`SalishSeaCmd` package is developed using `Python`_ 3.12.
+The minimum supported Python version is 3.11.
 The :ref:`SalishSeaCmdContinuousIntegration` workflow on GitHub ensures that the package
-is tested for all versions of Python>=3.10.
+is tested for all versions of Python>=3.11.
 An old version of the package running under Python 3.5 is depoloyed on the
 Westgrid :kbd:`orcinus` HPC platform.
 That version is tagged in the repository as ``orcinus-python-3.5``.
@@ -349,7 +349,7 @@ The output looks something like::
   (line  497) ok        https://github.com/SalishSeaCast/SalishSeaCmd/issues
   (line  491) ok        https://github.com/SalishSeaCast/SalishSeaCmd/issues
   (line   21) ok        https://img.shields.io/badge/license-Apache%202-cb2533.svg
-  (line   21) ok        https://img.shields.io/badge/Python-3.10%20%7C%203.11-blue?logo=python&label=Python&logoColor=gold
+  (line   21) ok        https://img.shields.io/badge/Python-3.11%20%7C%203.12-blue?logo=python&label=Python&logoColor=gold
   (line   21) ok        https://img.shields.io/badge/version%20control-git-blue.svg?logo=github
   (line   21) ok        https://img.shields.io/badge/code%20style-black-000000.svg
   (line   21) ok        https://codecov.io/gh/SalishSeaCast/SalishSeaCmd/branch/main/graph/badge.svg
diff --git a/envs/environment-dev.yaml b/envs/environment-dev.yaml
index 2ddff30..c91a36e 100644
--- a/envs/environment-dev.yaml
+++ b/envs/environment-dev.yaml
@@ -5,8 +5,8 @@
 #
 #   $ conda env create -f SalishSeaCmd/envs/environment-dev.yaml
 #   $ conda activate salishsea-cmd
-#   (salishsea-cmd)$ python3 -m pip install --editable NEMO-Cmd/
-#   (salishsea-cmd)$ python3 -m pip install --editable SalishSeaCmd/
+#   (salishsea-cmd)$ python -m pip install --editable NEMO-Cmd/
+#   (salishsea-cmd)$ python -m pip install --editable SalishSeaCmd/
 #
 # The environment includes all the tools used to develop,
 # test, and document the SalishSeaCmd package.
@@ -27,7 +27,7 @@ dependencies:
   - f90nml
   - gitpython
   - pip
-  - python=3.11
+  - python=3.12
   - pyyaml
 
   # For coding style, repo QA, and pkg management
diff --git a/envs/environment-hpc.yaml b/envs/environment-hpc.yaml
index 7f6c51f..65eb946 100644
--- a/envs/environment-hpc.yaml
+++ b/envs/environment-hpc.yaml
@@ -4,8 +4,8 @@
 #
 #   $ conda env create -f SalishSeaCmd/envs/environment-hpc.yaml
 #   $ conda activate salishsea-cmd
-#   (salishsea-cmd)$ python3 -m pip install --user --editable NEMO-Cmd/
-#   (salishsea-cmd)$ python3 -m pip install --user --editable SalishSeaCmd/
+#   (salishsea-cmd)$ python -m pip install --user --editable NEMO-Cmd/
+#   (salishsea-cmd)$ python -m pip install --user --editable SalishSeaCmd/
 
 name: salishsea-cmd
 
@@ -19,7 +19,7 @@ dependencies:
   - f90nml
   - gitpython
   - pip
-  - python=3.11
+  - python=3.12
   - pyyaml
 
   - pip:
diff --git a/envs/environment-rtd.yaml b/envs/environment-rtd.yaml
index 1dcb8b3..9bf12d7 100644
--- a/envs/environment-rtd.yaml
+++ b/envs/environment-rtd.yaml
@@ -12,7 +12,7 @@ channels:
 
 dependencies:
   - pip
-  - python=3.11
+  - python=3.12
 
   # readthedocs packages
   - mock
diff --git a/envs/requirements.txt b/envs/requirements.txt
index 2e2080b..10ca0df 100644
--- a/envs/requirements.txt
+++ b/envs/requirements.txt
@@ -5,33 +5,32 @@
 # to create an isolated development environment.
 #
 # Create/update this file with:
-#   (salishsea-cmd)$ python3 -m pip list --format=freeze >> envs/requirements.txt
+#   (salishsea-cmd)$ python -m pip list --format=freeze >> envs/requirements.txt
 
 alabaster==0.7.13
-anyio==4.0.0
+anyio==4.1.0
 arrow==1.3.0
 attrs==23.1.0
 autopage==0.5.2
 Babel==2.13.1
-backports.functools-lru-cache==1.6.5
 black==23.10.1
 Brotli==1.1.0
-certifi==2023.7.22
+certifi==2023.11.17
 cffi==1.16.0
 cfgv==3.3.1
-charset-normalizer==3.3.1
+charset-normalizer==3.3.2
 click==8.1.7
-cliff==4.2.0
+cliff==4.4.0
 cmd2==2.4.3
 colorama==0.4.6
 coverage==7.3.2
-cryptography==41.0.6
+cryptography==41.0.7
 distlib==0.3.7
-docutils==0.17.1
+docutils==0.20.1
 editables==0.3
-exceptiongroup==1.1.3
+exceptiongroup==1.2.0
 f90nml==1.4.4
-filelock==3.12.4
+filelock==3.13.1
 gitdb==4.0.11
 GitPython==3.1.40
 h11==0.14.0
@@ -39,19 +38,19 @@ h2==4.1.0
 hatch==1.7.0
 hatchling==1.18.0
 hpack==4.0.0
-httpcore==0.18.0
-httpx==0.25.0
+httpcore==1.0.2
+httpx==0.25.2
 hyperframe==6.0.1
 hyperlink==21.0.0
-identify==2.5.30
-idna==3.4
+identify==2.5.32
+idna==3.6
 imagesize==1.4.1
 importlib-metadata==6.8.0
 iniconfig==2.0.0
 jaraco.classes==3.3.0
 jeepney==0.8.0
 Jinja2==3.1.2
-keyring==24.2.0
+keyring==24.3.0
 markdown-it-py==3.0.0
 MarkupSafe==2.1.3
 mdurl==0.1.0
@@ -60,16 +59,16 @@ mypy-extensions==1.0.0
 nodeenv==1.8.0
 packaging==23.2
 pathspec==0.11.2
-pbr==5.11.1
+pbr==6.0.0
 pexpect==4.8.0
 pip==23.3.1
-platformdirs==3.11.0
+platformdirs==4.0.0
 pluggy==1.3.0
 pre-commit==3.5.0
 prettytable==3.9.0
 ptyprocess==0.7.0
 pycparser==2.21
-Pygments==2.16.1
+Pygments==2.17.2
 pyperclip==1.8.2
 PySocks==1.7.1
 pytest==7.4.3
@@ -80,7 +79,7 @@ python-hglib==2.6.2
 pytz==2023.3.post1
 PyYAML==6.0.1
 requests==2.31.0
-rich==13.6.0
+rich==13.7.0
 SecretStorage==3.3.3
 setuptools==68.2.2
 shellingham==1.5.4
@@ -88,9 +87,9 @@ six==1.16.0
 smmap==5.0.0
 sniffio==1.3.0
 snowballstemmer==2.2.0
-Sphinx==5.3.0
+Sphinx==7.2.6
 sphinx-notfound-page==1.0.0
-sphinx-rtd-theme==1.3.0
+sphinx-rtd-theme==2.0.0
 sphinxcontrib-applehelp==1.0.7
 sphinxcontrib-devhelp==1.0.5
 sphinxcontrib-htmlhelp==2.0.4
@@ -102,14 +101,14 @@ stevedore==5.1.0
 toml==0.10.2
 tomli==2.0.1
 tomli_w==1.0.0
-tomlkit==0.12.1
-trove-classifiers==2023.10.18
+tomlkit==0.12.3
+trove-classifiers==2023.11.29
 types-python-dateutil==2.8.19.14
 typing_extensions==4.8.0
 ukkonen==1.0.1
-urllib3==2.0.7
+urllib3==2.1.0
 userpath==1.7.0
-virtualenv==20.24.6
-wcwidth==0.2.8
-wheel==0.41.2
+virtualenv==20.24.7
+wcwidth==0.2.12
+wheel==0.42.0
 zipp==3.17.0
diff --git a/pyproject.toml b/pyproject.toml
index d913240..eb63835 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ name = "SalishSeaCmd"
 dynamic = [ "version" ]
 description = "SalishSeaCast NEMO Command Processor"
 readme = "README.rst"
-requires-python = ">=3.10"
+requires-python = ">=3.11"
 license = { file = "LICENSE" }
 authors = [
     { name = "Doug Latornell", email = "dlatornell@eoas.ubc.ca" },
@@ -37,20 +37,6 @@ keywords = [
     "automation", "oceanography", "ocean modelling",
     "UBC-MOAD", "Salish Sea", "SalishSeaCast",
 ]
-classifiers = [
-    "Development Status :: 5 - Production/Stable",
-    "License :: OSI Approved :: Apache Software License",
-    "Programming Language :: Python :: Implementation :: CPython",
-    "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.10",
-    "Programming Language :: Python :: 3.11",
-    "Operating System :: POSIX :: Linux",
-    "Operating System :: Unix",
-    "Environment :: Console",
-    "Intended Audience :: Science/Research",
-    "Intended Audience :: Education",
-    "Intended Audience :: Developers",
-]
 dependencies = [
     # see envs/environment-dev.yaml for conda environment dev installation
     # see envs/requirements.txt for versions most recently used in development