diff --git a/internal/rpc/rpc_client.go b/internal/rpc/rpc_client.go
index a032aad..f5f9f18 100644
--- a/internal/rpc/rpc_client.go
+++ b/internal/rpc/rpc_client.go
@@ -231,8 +231,8 @@ func (this *RPCClient) init() error {
 		}
 		var conn *grpc.ClientConn
 		var callOptions = grpc.WithDefaultCallOptions(
-			grpc.MaxCallRecvMsgSize(128*1024*1024),
-			grpc.MaxCallSendMsgSize(128*1024*1024),
+			grpc.MaxCallRecvMsgSize(512<<20),
+			grpc.MaxCallSendMsgSize(512<<20),
 			grpc.UseCompressor(gzip.Name),
 		)
 		if u.Scheme == "http" {