diff --git a/pyproject.toml b/pyproject.toml
index 2de2c957b..329728966 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,7 +31,6 @@ asyncio_mode = "auto"
 [tool.mypy]
 ignore_missing_imports = true
 namespace_packages = false
-implicit_optional = true
 warn_unused_ignores = true
 exclude = [
     '^build_helpers\.py$'