diff --git a/setup.cfg b/setup.cfg
index 218cadc..18edf63 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -21,7 +21,7 @@ ignore_missing_imports = true
 
 [testenv:flake8]
 deps =
-    flake8
+    flake8<=5.*
     flake8-quotes
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/tests/requirements.txt