diff --git a/lib/config/options/index.ts b/lib/config/options/index.ts
index 2d5009f81ad6501c802a2f6d10b4048b05121e64..f71066be46c06b4e363af7d43b73e5279e9a3e16 100644
--- a/lib/config/options/index.ts
+++ b/lib/config/options/index.ts
@@ -2176,6 +2176,7 @@ const options: RenovateOptions[] = [
       'composer',
       'gomod',
       'npm',
+      'pep621',
       'pipenv',
       'poetry',
     ],