diff --git a/pyproject.toml b/pyproject.toml
index 714e47d..aabc9a8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,7 +55,7 @@ optional-dependencies.dev = [
     "pytest==8.3.4",
     "pytest-cov==6.0.0",
     "requests==2.32.3",
-    "ruff==0.8.6",
+    "ruff==0.9.0",
     # 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.