diff --git a/library/train_util.py b/library/train_util.py
index b569b05d..5eb1da1f 100644
--- a/library/train_util.py
+++ b/library/train_util.py
@@ -3604,11 +3604,6 @@ def add_training_arguments(parser: argparse.ArgumentParser, support_dreambooth:
         type=int,
         help="DPO KL Divergence penalty. Recommended values for SD1.5 B=2000, SDXL B=5000 / DPO KL 発散ペナルティ。SD1.5 の推奨値 B=2000、SDXL B=5000",
     )
-    parser.add_argument(
-        "--orpo_weight",
-        type=float,
-        help="ORPO weight for relative ratio loss. Recommended values of 0.1 to 0.25 / 相対比損失の ORPO 重み。推奨値は 0.1 ～ 0.25 です",
-    )
     parser.add_argument(
         "--mapo_weight",
         type=float,