diff --git a/Makefile b/Makefile
index b9b25fe..e9e663d 100644
--- a/Makefile
+++ b/Makefile
@@ -19,4 +19,12 @@ ch13:
 	python scripts/sim_stroop.py
 	python scripts/ch13_stroop_within.py --save-plots
 	python scripts/sim_fitness_2x2.py
-	python scripts/ch13_fitness_mixed.py --save-plots
\ No newline at end of file
+	python scripts/ch13_fitness_mixed.py --save-plots
+
+.PHONY: lint format test
+lint:
+	ruff check .
+format:
+	black .
+test:
+	pytest -q || true
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..63baba7
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,3 @@
+ruff>=0.6
+black>=24.8
+pytest>=8.3