diff --git a/tox.ini b/tox.ini
index 300ee4ef..f7439d1e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -48,7 +48,7 @@ deps = sphinx
 commands = sphinx-build -b html . _build/html
 
 [flake8]
-max-line-length = 88
+max-line-length = 120
 exclude = .eggs,.tox
 # rationale here:
 # https://github.com/psf/black/blob/master/docs/the_black_code_style.md#slices