diff --git a/pyproject.toml b/pyproject.toml
index 0971924..1b86523 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -64,7 +64,7 @@ test = [
     "pytest-cov >= 2.12.0,<5.0.0",
     "mypy == 1.4.1",
     "ruff ==0.0.286",
-    "black == 23.7.0",
+    "black == 23.9.1",
     "pytest-asyncio",
     "autoflake",
     "types-python-dateutil",