diff --git a/pyproject.toml b/pyproject.toml
index a59b2e5..57f1bfe 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,7 +17,7 @@ dependencies = ["click~=8.0"]
 isd = "isd.cli:main"
 
 [project.optional-dependencies]
-dev = ["mypy~=1.2", "pre-commit~=4.0", "pytest~=8.0", "ruff~=0.8.0"]
+dev = ["mypy~=1.2", "pre-commit~=4.0", "pytest~=8.0", "ruff~=0.9.1"]
 examples = ["tqdm~=4.66"]
 docs = ["sphinx~=8.0"]
 polars = ["polars~=1.19.0"]