diff --git a/pyproject.toml b/pyproject.toml
index e433a01..5d518a7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -57,7 +57,7 @@ optional-dependencies.dev = [
     "pytest==8.3.5",
     "pytest-cov==6.1.1",
     "pytest-regressions==2.7.0",
-    "ruff==0.11.8",
+    "ruff==0.11.9",
     # We add shellcheck-py not only for shell scripts and shell code blocks,
     # but also because having it installed means that ``actionlint-py`` will
     # use it to lint shell commands in GitHub workflow files.