diff --git a/tox.ini b/tox.ini
index 133fd07..f577b49 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,5 +11,7 @@ commands = pytest -m "not needs_server" --cov=bepasty --pyargs {posargs:bepasty.
 
 [testenv:flake8]
 changedir =
-deps = flake8
+deps =
+    flake8
+    flake8-pyproject
 commands = flake8 src/