Add instructions for managing Python dependencies

README.md

@@ -130,6 +130,35 @@ environment variables.  See the
 
 1. Recreate and run the container by following the [previous instructions](#running-with-docker).
 
+## Updating Python dependencies ##
+
+This image uses [Pipenv] to manage Python dependencies using a [Pipfile](https://github.com/pypa/pipfile).
+Both updating dependencies and changing the [Pipenv] configuration in `src/Pipfile`
+will result in a modified `src/Pipfile.lock` file that should be committed to the
+repository.
+
+> [!WARNING]
+> The `src/Pipfile.lock` as generated will fail `pre-commit` checks due to JSON formatting.
+
+### Updating dependencies ###
+
+If you want to update existing dependencies you would run the following command
+in the `src/` subdirectory:
+
+```console
+pipenv lock
+```
+
+### Modifying dependencies ###
+
+If you want to add or remove dependencies you would update the `src/Pipfile` file
+and then update dependencies as you would above.
+
+> [!NOTE]
+> You should only specify packages that are explicitly needed for your Docker
+> configuration. Allow [Pipenv] to manage the dependencies of the specified
+> packages.
+
 ## Image tags ##
 
 The images of this container are tagged with [semantic
@@ -254,3 +283,5 @@ dedication](https://creativecommons.org/publicdomain/zero/1.0/).
 All contributions to this project will be released under the CC0
 dedication. By submitting a pull request, you are agreeing to comply
 with this waiver of copyright interest.
+
+[Pipenv]: https://pypi.org/project/pipenv/