diff --git a/third_party/libwebrtc/README.moz-ff-commit b/third_party/libwebrtc/README.moz-ff-commit
index bc67e0cf2dc2a..1a7b3de8e6578 100644
--- a/third_party/libwebrtc/README.moz-ff-commit
+++ b/third_party/libwebrtc/README.moz-ff-commit
@@ -24657,3 +24657,6 @@ aa6c910f47
 # MOZ_LIBWEBRTC_SRC=/Users/mfroman/no_tm_backup/elm/.moz-fast-forward/moz-libwebrtc MOZ_LIBWEBRTC_BRANCH=mozpatches bash dom/media/webrtc/third_party_build/fast-forward-libwebrtc.sh
 # base of lastest vendoring
 44bc8e96ed
+# MOZ_LIBWEBRTC_SRC=/Users/mfroman/no_tm_backup/elm/.moz-fast-forward/moz-libwebrtc MOZ_LIBWEBRTC_BRANCH=mozpatches bash dom/media/webrtc/third_party_build/fast-forward-libwebrtc.sh
+# base of lastest vendoring
+402f60c2ea
diff --git a/third_party/libwebrtc/README.mozilla b/third_party/libwebrtc/README.mozilla
index 6c930e09e5db5..09e5ede0abd95 100644
--- a/third_party/libwebrtc/README.mozilla
+++ b/third_party/libwebrtc/README.mozilla
@@ -16460,3 +16460,5 @@ libwebrtc updated from /Users/mfroman/no_tm_backup/elm/.moz-fast-forward/moz-lib
 libwebrtc updated from /Users/mfroman/no_tm_backup/elm/.moz-fast-forward/moz-libwebrtc commit mozpatches on 2023-09-27T04:08:52.973541.
 # ./mach python dom/media/webrtc/third_party_build/vendor-libwebrtc.py --from-local /Users/mfroman/no_tm_backup/elm/.moz-fast-forward/moz-libwebrtc --commit mozpatches libwebrtc
 libwebrtc updated from /Users/mfroman/no_tm_backup/elm/.moz-fast-forward/moz-libwebrtc commit mozpatches on 2023-09-27T04:10:08.028101.
+# ./mach python dom/media/webrtc/third_party_build/vendor-libwebrtc.py --from-local /Users/mfroman/no_tm_backup/elm/.moz-fast-forward/moz-libwebrtc --commit mozpatches libwebrtc
+libwebrtc updated from /Users/mfroman/no_tm_backup/elm/.moz-fast-forward/moz-libwebrtc commit mozpatches on 2023-09-27T04:11:23.619074.
diff --git a/third_party/libwebrtc/modules/pacing/packet_router.cc b/third_party/libwebrtc/modules/pacing/packet_router.cc
index ba133f3d1f313..4c986ad027cd4 100644
--- a/third_party/libwebrtc/modules/pacing/packet_router.cc
+++ b/third_party/libwebrtc/modules/pacing/packet_router.cc
@@ -68,7 +68,7 @@ void PacketRouter::AddSendRtpModule(RtpRtcpInterface* rtp_module,
 void PacketRouter::AddSendRtpModuleToMap(RtpRtcpInterface* rtp_module,
                                          uint32_t ssrc) {
   RTC_DCHECK_RUN_ON(&thread_checker_);
-  RTC_DCHECK(send_modules_map_.find(ssrc) == send_modules_map_.end());
+  RTC_CHECK(send_modules_map_.find(ssrc) == send_modules_map_.end());
 
   // Signal to module that the pacer thread is attached and can send packets.
   rtp_module->OnPacketSendingThreadSwitched();