diff --git a/README.md b/README.md
index 754cb9d..298346c 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-[![libwebrtc](https://img.shields.io/badge/libwebrtc-122.6261-blue.svg)](https://chromium.googlesource.com/external/webrtc/+/branch-heads/5993)
+[![libwebrtc](https://img.shields.io/badge/libwebrtc-121.6167-blue.svg)](https://chromium.googlesource.com/external/webrtc/+/branch-heads/5993)
 [![GitHub tag](https://img.shields.io/github/tag/webrtc-alive/webrtc-build.svg)](https://github.com/webrtc-alive/webrtc-build)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 [![Actions Status](https://github.com/webrtc-alive/webrtc-build/workflows/build/badge.svg)](https://github.com/webrtc-alive/webrtc-build/actions)
diff --git a/build/VERSION b/build/VERSION
index 9c602f4..ce50e49 100644
--- a/build/VERSION
+++ b/build/VERSION
@@ -1,4 +1,4 @@
 WEBRTC_BUILD_VERSION=HEAD
 WEBRTC_VERSION=HEAD
 WEBRTC_READABLE_VERSION=HEAD
-WEBRTC_COMMIT=b490f7b382c68d291563bde71210c111aa0697fa
+WEBRTC_COMMIT=35cfc79d2d5b6a3848d7bf488380002dc3c0ef44
diff --git a/webrtc_build_settings.yaml b/webrtc_build_settings.yaml
index d2a0594..83ae423 100644
--- a/webrtc_build_settings.yaml
+++ b/webrtc_build_settings.yaml
@@ -5,7 +5,7 @@ env:
 downloads:
   webrtc_src:
     repo: https://github.com/webrtcsdk/webrtcsdk.git
-    branch: kairtc-m121
+    branch: kairtc-m121-exp
     path: src
 
   depot_tools:
diff --git a/webrtc_version.yaml b/webrtc_version.yaml
index 6145fb2..dcac497 100644
--- a/webrtc_version.yaml
+++ b/webrtc_version.yaml
@@ -1,4 +1,4 @@
-WEBRTC_BUILD_VERSION: 122.6261.01.1
-WEBRTC_VERSION: 122.6261.01
-WEBRTC_READABLE_VERSION: M122.6261
-WEBRTC_COMMIT: b490f7b382c68d291563bde71210c111aa0697fa
+WEBRTC_BUILD_VERSION: 121.6167.04.1
+WEBRTC_VERSION: 121.6167.04
+WEBRTC_READABLE_VERSION: M121.6167
+WEBRTC_COMMIT: 35cfc79d2d5b6a3848d7bf488380002dc3c0ef44