diff --git a/.python-version b/.python-version
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--- /dev/null
+++ b/.python-version
@@ -0,0 +1,5 @@
+3.7
+3.8
+3.9
+3.10
+3.11
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+++ b/CONTRIBUTING.md
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+# Contributing
+
+`django-devdata` uses Poetry for packaging and Tox for testing. It is
+recommended that you use Pyenv to provide versions of Python for testing, and
+that you _do not_ use virtualenvs, but instead just use Poetry's built-in
+virtualenv handling.
+
+### Testing
+
+```
+poetry run tox
+```
+
+This should run all the tests across the supported Python and Django version
+combinations.