diff --git a/backend/requirements-dev.txt b/backend/requirements-dev.txt
new file mode 100644
index 0000000..6645938
--- /dev/null
+++ b/backend/requirements-dev.txt
@@ -0,0 +1,4 @@
+# Dev/test-only dependencies (not installed on the Render deploy).
+#   pip install -r requirements.txt -r requirements-dev.txt
+#   python -m pytest tests/
+pytest>=8.0