diff --git a/pyproject.toml b/pyproject.toml
index 2a0933d..3197881 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ mcp = [
 dev = [
   "pytest>=8.4.2",
   "pytest-cov>=7.1.0",
-  "ruff>=0.15.16",
+  "ruff>=0.15.18",
   "mypy>=1.19.1",
   "black>=25.11.0",
   # MCP transport is optional in dev too — guarded by Python version so