diff --git a/pyproject.toml b/pyproject.toml
index caa757d..170a831 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,7 +20,7 @@ isd = "isd.cli:main"
 dev = ["mypy~=1.2", "pre-commit~=4.0", "pytest~=8.0", "ruff~=0.6.1"]
 examples = ["tqdm~=4.66"]
 docs = ["sphinx~=8.0"]
-polars = ["polars~=1.4.1"]
+polars = ["polars~=1.9.0"]
 pandas = ["pandas~=2.0"]
 
 [build-system]