diff --git a/pyproject.toml b/pyproject.toml
index 1cb70a8e..78c49d57 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ Homepage = "https://github.com/testing-cabal/testtools"
 test = ["testscenarios", "testresources"]
 twisted = ["Twisted", "fixtures"]
 dev = [
-    "ruff==0.15.5",
+    "ruff==0.15.6",
     "mypy>=1.0.0",
     "typing-extensions;python_version<'3.11'",
 ]