diff --git a/pyproject.toml b/pyproject.toml
index 7435f9614..e51bdeb3e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ line-length = 100
 indent-width = 4
 
 # Assume Python 3.8
-target-version = "py39"
+target-version = "py38"
 
 [tool.ruff.lint]
 # Enable Pyflakes (`F`) and a subset of the pycodestyle (`E`)  codes by default.