diff --git a/pyproject.toml b/pyproject.toml
index 4878d10..509d0f5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ license = {text = "MIT"}
 authors = [
     {name = "Brian S. Stephan", email = "bss@incorporeal.org"},
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = ["grpcio-tools"]
 dynamic = ["version"]