diff --git a/tox.ini b/tox.ini
index 84d5b716..35b58297 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ skip_missing_interpreters = True
 envlist = py,pypy3
 
 [testenv]
-deps = flake8==4.0.1
+deps = flake8==6.0.0
 setenv = PYFLAKES_ERROR_UNKNOWN=1
 commands =
     python --version --version