diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 00000000..a53246c5
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,5 @@
+[build-system]
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
+[tool.black]
+line-length = 120
diff --git a/tox.ini b/tox.ini
index 1323d36d..84245697 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,5 +17,5 @@ deps =
 [flake8]
 exclude = .tox,env,build,cocoalib,cocoa,help,./qt/dg_rc.py,cocoa/run_template.py,./pkg
 max-line-length = 120
-ignore = E731,E203,E501,W503
-
+select = C,E,F,W,B,B950
+extend-ignore = E203, E501