diff --git a/pyproject.toml b/pyproject.toml
index 1900e4137..bc2785fb2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -129,7 +129,7 @@ default = { features = ["py312"], solve-group = "py312" }
 py312 = { features = ["py312"], solve-group = "py312" }
 py311 = ["py311"]
 py310 = ["py310"]
-py309 = ["py310"]
+py309 = ["py309"]
 
 [tool.ruff.lint]
 # See https://docs.astral.sh/ruff/rules/