diff --git a/pyproject.toml b/pyproject.toml
index fe27bf47..e09fa46e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,11 +21,7 @@ dependencies = [
 requires = ["flit_core >=3.4,<4"]
 build-backend = "flit_core.buildapi"
 
-[tool.black]
-line-length = 99
-
 [tool.isort]
-line_length = 99
 multi_line_output = 3
 include_trailing_comma = true
 force_grid_wrap = 0