diff --git a/setup.py b/setup.py
index 3319a7cf2..6992c2eec 100644
--- a/setup.py
+++ b/setup.py
@@ -60,6 +60,7 @@ def read(fname):
             'pytest-watch',
             'pytest-flask',
             'pytest-flake8',
+            'flake8<5',
             'bumpversion',
             'autopep8',
             'importlib_metadata'