diff --git a/tox.ini b/tox.ini
index 96ded84..d5870c8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,7 +34,7 @@ commands =
 description = Check code against coding style standards
 deps =
     black
-    flake8
+    flake8==4.0.1
     flake8-docstrings
     flake8-builtins
     pyproject-flake8