diff --git a/libs/core/pyproject.toml b/libs/core/pyproject.toml
index 96abaa5db89..9647a19569a 100644
--- a/libs/core/pyproject.toml
+++ b/libs/core/pyproject.toml
@@ -40,6 +40,9 @@ python = ">=3.12.4"
 
 [tool.poetry.extras]
 
+[tool.ruff]
+target-version = "py39"
+
 [tool.ruff.lint]
 select = ["B", "E", "F", "I", "T201", "UP"]
 ignore = ["UP007"]