diff --git a/pyproject.toml b/pyproject.toml
index 23b547a..5cd32a7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -119,7 +119,7 @@ dev = [
     "pytest-asyncio>=1.3.0",
     "pytest-xdist>=3.8.0",        # parallel test runner for unit/contract layer
     "pytest-recording>=0.13",   # pytest plugin wrapper for vcrpy
-    "ruff>=0.15.15",
+    "ruff>=0.15.20",
     "httpx>=0.28.1",            # FastAPI TestClient runtime
     "fakeredis>=2.26",          # in-memory Redis for unit tests (async-compatible)
     "aiosqlite>=0.20",          # in-memory SQLite via SQLAlchemy for unit tests