diff --git a/pyproject.toml b/pyproject.toml
index 063e8c8..59a5143 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,7 +20,7 @@ dependencies = [
     "causaldata>=0.1.4,<0.2",
     "pystata>=0.0.1,<0.0.2",
     "pre-commit>=3.8.0,<5",
-    "ruff>=0.5.7,<0.8",
+    "ruff>=0.5.7,<0.9",
     "sqlfluff>=3.1.0,<4",
     "mdformat>=0.7.17,<0.8",
     "mdformat-pyproject>=0.0.1,<0.0.2",