diff --git a/pyproject.toml b/pyproject.toml
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -73,6 +73,3 @@ name = "pypi"
 url = "https://pypi.org/simple"
 verify_ssl = true
 
-[build-system]
-requires = ["pdm-pep517"]
-build-backend = "pdm.pep517.api"