--- a/pyproject.toml
+++ b/pyproject.toml
@@ -70,6 +70,6 @@
 
 [build-system]
 requires = [
-    "pdm-pep517>=1.0.0",
+    "pdm-backend>=1.0.5",
 ]
-build-backend = "pdm.pep517.api"
+build-backend = "pdm.backend"