diff --git a/scripts/workers/services/mcs150_update.py b/scripts/workers/services/mcs150_update.py
index a0b73a6..eb6ca97 100644
--- a/scripts/workers/services/mcs150_update.py
+++ b/scripts/workers/services/mcs150_update.py
@@ -120,9 +120,8 @@ class MCS150UpdateHandler:
                 )
                 bucket = os.environ.get("MINIO_BUCKET", "performancewest")
                 minio_path = f"filings/mcs150/{order_number}/{os.path.basename(pdf_path)}"
-                mc.fobj_put(bucket, minio_path, open(pdf_path, "rb"),
-                            length=os.path.getsize(pdf_path),
-                            content_type="application/pdf")
+                mc.fput_object(bucket, minio_path, pdf_path,
+                               content_type="application/pdf")
                 # Generate presigned URL for fax/web submission
                 from datetime import timedelta
                 pdf_url = mc.presigned_get_object(bucket, minio_path, expires=timedelta(hours=2))