diff --git a/pyproject.toml b/pyproject.toml
index 8a12ea7..9a73fed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ dependencies = [
 dev = [
     "pytest==9.0.3",
     "pytest-asyncio==1.3.0",
-    "black==26.3.1",
+    "black==26.5.1",
     "mypy==1.20.2",
     "types-PyYAML==6.0.12.20260408",
     "types-Markdown==3.10.2.20260408",