diff --git a/noxfile.py b/noxfile.py
new file mode 100644
index 0000000..44afb33
--- /dev/null
+++ b/noxfile.py
@@ -0,0 +1,13 @@
+"""Configure nox as the task runner."""
+
+import nox
+
+
+PYTHON = "3.8"
+
+# Use a unified .cache/ folder for all develop tools.
+nox.options.envdir = ".cache/nox"
+
+# All tools except git and poetry are project dependencies.
+# Avoid accidental successes if the environment is not set up properly.
+nox.options.error_on_external_run = True