diff --git a/pyproject.toml b/pyproject.toml
index 1e3ed3f..14a4a6a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,7 @@ ruff = "^0.4.8"
 types-toml = "^0.10.8.1"
 types-redis = "^4.3.21.6"
 types-pytz = "^2024.1.0.20240417"
-black = "^24.4.2"
+black = ">=24.4.2,<27.0.0"
 types-chardet = "^5.0.4.6"
 mypy-protobuf = "^3.0.0"