diff --git a/pyproject.toml b/pyproject.toml
index df7bbd4..532f8bc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ extend_skip = ["api_pb2.py", "api_options_pb2.py"]
 
 [tool.black]
 exclude = 'api_pb2.py|api_options_pb2.py'
-target-version = ['py37']
+target-version = ['py39']
 
 [tool.pylint.MASTER]
 reports = 'no'