diff --git a/tox.ini b/tox.ini
index 2c13d9606b9e121c4543b3e5ea082552092b68ef..11b4878dd2584b14eb53173d87dafde12439c996 100644
--- a/tox.ini
+++ b/tox.ini
@@ -53,7 +53,7 @@ deps=
 #   regressions when new checks are introduced. The version of flake8 used may
 #   be overridden via the TOXINI_FLAKE8_VERSION environment variable.
     mock
-    flake8=={env:TOXINI_FLAKE8_VERSION:3.6.0}
+    flake8=={env:TOXINI_FLAKE8_VERSION:3.9.2}
 commands=
     flake8 --version
     flake8 .