diff --git a/pyproject.toml b/pyproject.toml
index 120242483..29cff2957 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,6 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "lsst-pipe-base"
+requires-python = ">=3.10.0"
 description = "Pipeline infrastructure for the Rubin Science Pipelines."
 license = {text = "GPLv3+ License"}
 readme = "README.md"