diff --git a/tox.ini b/tox.ini
index e0bc073..d2c5a89 100644
--- a/tox.ini
+++ b/tox.ini
@@ -42,7 +42,8 @@ skip_install = true
 
 [testenv:linter]
 deps=
-    flake8==3.8.2
+    flake8==4.0.1
+    flake8-debug==0.1.0
     isort>=5.0.1
 setenv =
     BUILD=linter