diff --git a/pyproject.toml b/pyproject.toml
index 4725e860b..c14a547a8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,7 @@
 [project]
 name = "bitbake"
 version = "2.19.0"
+requires-python = ">=3.9"
 
 [tool.vendoring]
 destination = "lib/bb/_vendor"