diff --git a/pyproject.toml b/pyproject.toml
index bfc7c472..faf9d050 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ Homepage = "https://github.com/testing-cabal/testtools"
 test = ["fixtures", "testscenarios", "testresources"]
 twisted = ["Twisted", "fixtures"]
 dev = [
-    "ruff==0.16.7",
+    "ruff==0.16.9",
     "mypy>=1.20.0",
     "typing-extensions;python_version<'3.11'",
 ]