diff --git a/pyproject.toml b/pyproject.toml
index bed0f509dc8b40de9e4102363dada997d68ea441..85e8cf61e12e2ca72e483ed10750b776b8cbec4d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ requires-python = "^3.9"
 
 [tool.black]
 line-length = 99
-target-version = ["py38"]
+target-version = ["py39"]
 exclude = '''
 '''