diff --git a/train_network.py b/train_network.py
index 7dbd12e8..7e9f1265 100644
--- a/train_network.py
+++ b/train_network.py
@@ -125,7 +125,7 @@ class NetworkTrainer:
         return logs
 
     def assert_extra_args(self, args, train_dataset_group):
-        train_dataset_group.verify_bucket_reso_steps(32)
+        train_dataset_group.verify_bucket_reso_steps(64)
 
     def load_target_model(self, args, weight_dtype, accelerator):
         text_encoder, vae, unet, _ = train_util.load_target_model(args, weight_dtype, accelerator)