diff --git a/pyproject.toml b/pyproject.toml
index 72e0b700..b7a414ae 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -410,7 +410,7 @@ dev = [
   "mypy>=1.10",
   "ruff>=0.5",
   "types-PyYAML>=6.0.12",
-  "black==26.5.1",
+  "black==26.10.1",
   "requests>=2.32.5",
   # Architecture linter — declarative TOML contracts (under
   # ``[tool.importlinter]`` below) enforced by the ``lint-imports`` CLI.