diff --git a/pyproject.toml b/pyproject.toml
index 7335ba7..03e68c5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -79,7 +79,7 @@ dev = [
     # (wired only into the test-windows job in ci.yml, scoped to the specific
     # error). Local/Linux/macOS runs never rerun, so real failures stay loud.
     "pytest-rerunfailures>=12.0",
-    "ruff==0.15.20",
+    "ruff==0.16.1",
     "psutil>=5.9",
     # Property-based testing — generates hundreds of random inputs per
     # test to find counterexamples the hand-written positive tests miss.
@@ -147,7 +147,7 @@ dev = [
     # (wired only into the test-windows job in ci.yml, scoped to the specific
     # error). Local/Linux/macOS runs never rerun, so real failures stay loud.
     "pytest-rerunfailures>=12.0",
-    "ruff==0.15.20",
+    "ruff==0.16.1",
     "psutil>=5.9",
     "hypothesis>=6.0",
     "pre-commit>=3.0",