diff --git a/ozgcloud-common-lib/src/main/java/de/ozgcloud/common/binaryfile/GrpcFileUploadUtils.java b/ozgcloud-common-lib/src/main/java/de/ozgcloud/common/binaryfile/GrpcFileUploadUtils.java
index 74cd1c258566b7bfa16a8f8be86f1fbd1bfb7dd7..b021ed18935637b737f9d473dea168af8b8b9ca3 100644
--- a/ozgcloud-common-lib/src/main/java/de/ozgcloud/common/binaryfile/GrpcFileUploadUtils.java
+++ b/ozgcloud-common-lib/src/main/java/de/ozgcloud/common/binaryfile/GrpcFileUploadUtils.java
@@ -68,7 +68,7 @@ public class GrpcFileUploadUtils {
 		return new StreamSharingFileSender<>(chunkBuilder, inputStream, requestObserver, onReadyHandlerRegistrar);
 	}
 
-	// for backwards compatibility
+	@Deprecated(since = "4.13.0")
 	public static class FileSender<Q, S> extends StreamExclusiveFileSender<Q, S> {
 
 		FileSender(BiFunction<byte[], Integer, Q> chunkBuilder, InputStream inputStream,