diff --git a/pyproject.toml b/pyproject.toml
index f60d5b2..c3d7eaf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,7 +45,7 @@ tests = [
     "pandas-stubs~=2.0",
     "pytest~=8.0",
     "pytest-cov~=6.0",
-    "ruff~=0.8.1",
+    "ruff~=0.9.4",
 ]
 
 [project.urls]