diff --git a/0038-add-tso.patch b/0038-add-tso.patch
index 457efe8..d6a9841 100644
--- a/0038-add-tso.patch
+++ b/0038-add-tso.patch
@@ -269,7 +269,7 @@ index 2834ba3..ee6f40b 100644
 +        }
 +
 +        pre_pbuf = seg->p;
-+        next_seqno = seg_seqno + seg->len;
++        next_seqno = seg_seqno + TCP_TCPLEN(seg);
 +        seg = seg->next;
 +        pcb->unsent = seg;
 +        pbuf_chain_len++;
diff --git a/0041-optimite-pcb-list-limit-send-size-and-ack-now.patch b/0041-optimite-pcb-list-limit-send-size-and-ack-now.patch
index 0ca6a88..2c47b15 100644
--- a/0041-optimite-pcb-list-limit-send-size-and-ack-now.patch
+++ b/0041-optimite-pcb-list-limit-send-size-and-ack-now.patch
@@ -176,7 +176,7 @@ index f53750b..55053d8 100644
  
 +        send_len += seg->len;
          pre_pbuf = seg->p;
-         next_seqno = seg_seqno + seg->len;
+         next_seqno = seg_seqno + TCP_TCPLEN(seg);
          seg = seg->next;
 @@ -1519,8 +1520,11 @@ tcp_output(struct tcp_pcb *pcb)
  
diff --git a/lwip.spec b/lwip.spec
index 791242e..3c2acc1 100644
--- a/lwip.spec
+++ b/lwip.spec
@@ -4,7 +4,7 @@
 Summary: lwip is a small independent implementation of the TCP/IP protocol suite
 Name:    lwip
 Version: 2.1.3
-Release: 39
+Release: 40
 License: BSD
 URL:     http://savannah.nongnu.org/projects/lwip/
 Source0: http://download.savannah.nongnu.org/releases/lwip/%{name}-%{version}.zip
@@ -141,6 +141,9 @@ cd %{_builddir}/%{name}-%{version}/src
 %{_libdir}/liblwip.a
 
 %changelog
+* Sat Feb 11 2023 majun<majun65@huawei.com> - 2.1.3-40
+- fix TSO snd_nxt incorrectly update
+
 * Fri Dec 30 2022 wuchangsheng<wuchangsheng2@huawei.com> - 2.1.3-39
 - expand recv mbox size