diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e0da9393..c35f038f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -160,12 +160,19 @@ jobs:
           - name: ubuntu-20.04_x86_64
             runs-on: ubuntu-20.04
             os: ubuntu
+            arch: x86_64
           - name: ubuntu-22.04_x86_64
             runs-on: ubuntu-22.04
             os: ubuntu
+            arch: x86_64
           - name: ubuntu-24.04_x86_64
             runs-on: ubuntu-24.04
             os: ubuntu
+            arch: x86_64
+          - name: ubuntu-24.04_armv8
+            runs-on: ubuntu-24.04
+            os: ubuntu
+            arch: armv8
           - name: android
             runs-on: ubuntu-22.04
             os: android
@@ -216,7 +223,7 @@ jobs:
           Pin-Priority: 990
           EOF
       - name: Install deps for ${{ matrix.platform.name }}
-        if: matrix.platform.os == 'ubuntu'
+        if: matrix.platform.os == 'ubuntu' && matrix.platform.arch == 'x86_64'
         run: |
           source VERSION
           sudo apt-get update
@@ -238,6 +245,12 @@ jobs:
 
           # Intel Media SDK のために libva-dev, libdrm-dev を入れる
           DEBIAN_FRONTEND=noninteractive sudo apt-get -y install libva-dev libdrm-dev
+      - name: Install deps for ${{ matrix.platform.name }}
+        if: matrix.platform.os == 'ubuntu' && matrix.platform.arch == 'armv8'
+        run: |
+          sudo apt-get -y install multistrap binutils-aarch64-linux-gnu
+          # multistrap に insecure なリポジトリからの取得を許可する設定を入れる
+          sudo sed -e 's/Apt::Get::AllowUnauthenticated=true/Apt::Get::AllowUnauthenticated=true";\n$config_str .= " -o Acquire::AllowInsecureRepositories=true/' -i /usr/sbin/multistrap
       - name: Install deps for Android
         if: matrix.platform.os == 'android'
         run: |
@@ -283,13 +296,13 @@ jobs:
             python3 $app/${{ matrix.platform.name }}/run.py --local-sora-cpp-sdk-dir ..
             cp _build/${{ matrix.platform.name }}/release/$app/$app examples_${{ matrix.platform.name }}
           done
-        if: matrix.platform.os == 'ubuntu'
+        if: matrix.platform.os == 'ubuntu' && matrix.platform.arch == 'x86_64'
       - name: Upload Examples Artifact
         uses: actions/upload-artifact@v4
         with:
           name: examples_${{ matrix.platform.name }}
           path: examples/examples_${{ matrix.platform.name }}
-        if: matrix.platform.os == 'ubuntu'
+        if: matrix.platform.os == 'ubuntu' && matrix.platform.arch == 'x86_64'
 
   create-release:
     name: Create Release
@@ -319,6 +332,9 @@ jobs:
       - uses: ./.github/actions/download
         with:
           platform: ubuntu-24.04_x86_64
+      - uses: ./.github/actions/download
+        with:
+          platform: ubuntu-24.04_armv8
       - uses: ./.github/actions/download
         with:
           platform: android
diff --git a/CHANGES.md b/CHANGES.md
index 0cf5e1fd..54777f36 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -29,6 +29,8 @@
   - @tnoho
 - [ADD] ルート証明書を指定可能にする
   - @melpon
+- [ADD] Ubuntu 24.04 armv8 に対応する
+  - @melpon
 - [FIX] HTTP Proxy 利用時の Websocket 初期化で insecure_ メンバ変数が初期化されていなかったのを修正
   - @melpon
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index dd0e3660..ed33a818 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -50,6 +50,11 @@ elseif (SORA_TARGET STREQUAL "ubuntu-24.04_x86_64")
   set(SORA_TARGET_OS_VERSION "24.04")
   set(SORA_TARGET_ARCH "x86_64")
   set(SORA_TARGET_DEF "SORA_CPP_SDK_UBUNTU_2404")
+elseif (SORA_TARGET STREQUAL "ubuntu-24.04_armv8")
+  set(SORA_TARGET_OS "ubuntu")
+  set(SORA_TARGET_OS_VERSION "24.04")
+  set(SORA_TARGET_ARCH "armv8")
+  set(SORA_TARGET_DEF "SORA_CPP_SDK_UBUNTU_2404")
 endif()
 
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
diff --git a/VERSION b/VERSION
index d8e281fa..ca134f7e 100644
--- a/VERSION
+++ b/VERSION
@@ -1,5 +1,5 @@
 SORA_CPP_SDK_VERSION=2024.8.0-canary.7
-WEBRTC_BUILD_VERSION=m128.6613.2.0
+WEBRTC_BUILD_VERSION=m128.6613.3.1
 BOOST_VERSION=1.86.0
 CMAKE_VERSION=3.30.3
 CUDA_VERSION=11.8.0-1
diff --git a/buildbase.py b/buildbase.py
index b91e070b..6223e5db 100644
--- a/buildbase.py
+++ b/buildbase.py
@@ -1564,6 +1564,8 @@ def _check_platform_target(self, p: PlatformTarget):
             self._check(p.arch == "armv8")
         elif p.os in ("ios", "android"):
             self._check(p.arch is None)
+        elif p.os == "ubuntu":
+            self._check(p.arch in ("x86_64", "armv8"))
         else:
             self._check(p.arch in ("x86_64", "arm64"))
 
@@ -1590,7 +1592,8 @@ def __init__(self, target_os, target_osver, target_arch):
         if target.os == "ubuntu":
             self._check(build.os == "ubuntu")
             self._check(build.arch == "x86_64")
-            self._check(build.osver == target.osver)
+            if target.arch == "x86_64":
+                self._check(build.osver == target.osver)
         if target.os == "raspberry-pi-os":
             self._check(build.os == "ubuntu")
             self._check(build.arch == "x86_64")
diff --git a/multistrap/ubuntu-24.04_armv8.conf b/multistrap/ubuntu-24.04_armv8.conf
new file mode 100644
index 00000000..4b18038e
--- /dev/null
+++ b/multistrap/ubuntu-24.04_armv8.conf
@@ -0,0 +1,11 @@
+[General]
+noauth=true
+unpack=true
+bootstrap=Ports
+aptsources=Ports
+
+[Ports]
+packages=libstdc++-13-dev libc6-dev libxext-dev libdbus-1-dev
+source=http://ports.ubuntu.com
+suite=noble
+components=main universe
diff --git a/run.py b/run.py
index 587d6fd8..f60896ef 100644
--- a/run.py
+++ b/run.py
@@ -1,4 +1,5 @@
 import argparse
+import hashlib
 import logging
 import multiprocessing
 import os
@@ -31,6 +32,7 @@
     install_cuda_windows,
     install_llvm,
     install_openh264,
+    install_rootfs,
     install_vpl,
     install_webrtc,
     mkdir_p,
@@ -80,12 +82,20 @@ def get_common_cmake_args(
             args.append("-DCMAKE_C_COMPILER=clang-18")
             args.append("-DCMAKE_CXX_COMPILER=clang++-18")
         else:
+            sysroot = os.path.join(install_dir, "rootfs")
             args.append(
                 f"-DCMAKE_C_COMPILER={cmake_path(os.path.join(webrtc_info.clang_dir, 'bin', 'clang'))}"
             )
             args.append(
                 f"-DCMAKE_CXX_COMPILER={cmake_path(os.path.join(webrtc_info.clang_dir, 'bin', 'clang++'))}"
             )
+            args.append("-DCMAKE_SYSTEM_NAME=Linux")
+            args.append("-DCMAKE_SYSTEM_PROCESSOR=aarch64")
+            args.append(f"-DCMAKE_SYSROOT={sysroot}")
+            args.append("-DCMAKE_C_COMPILER_TARGET=aarch64-linux-gnu")
+            args.append("-DCMAKE_CXX_COMPILER_TARGET=aarch64-linux-gnu")
+            args.append(f"-DCMAKE_FIND_ROOT_PATH={sysroot}")
+            args.append("-DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER")
         path = cmake_path(os.path.join(webrtc_info.libcxx_dir, "include"))
         args.append(f"-DCMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES={path}")
         cxxflags = ["-nostdinc++", "-D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE"]
@@ -132,6 +142,19 @@ def install_deps(
     with cd(BASE_DIR):
         version = read_version_file("VERSION")
 
+        # multistrap を使った sysroot の構築
+        if platform.target.os == "ubuntu" and platform.target.arch == "armv8":
+            conf = os.path.join(BASE_DIR, "multistrap", f"{platform.target.package_name}.conf")
+            # conf ファイルのハッシュ値をバージョンとする
+            version_md5 = hashlib.md5(open(conf, "rb").read()).hexdigest()
+            install_rootfs_args = {
+                "version": version_md5,
+                "version_file": os.path.join(install_dir, "rootfs.version"),
+                "install_dir": install_dir,
+                "conf": conf,
+            }
+            install_rootfs(**install_rootfs_args)
+
         # Android NDK
         if platform.target.os == "android":
             install_android_ndk_args = {
@@ -300,10 +323,28 @@ def install_deps(
                 "-D_LIBCPP_DISABLE_AVAILABILITY",
                 "-D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE",
                 "-nostdinc++",
+                "-std=gnu++17",
                 f"-isystem{os.path.join(webrtc_info.libcxx_dir, 'include')}",
                 "-fPIC",
             ]
             install_boost_args["toolset"] = "clang"
+            if platform.target.arch == "armv8":
+                sysroot = os.path.join(install_dir, "rootfs")
+                install_boost_args["cflags"] += [
+                    f"--sysroot={sysroot}",
+                    "--target=aarch64-linux-gnu",
+                    f"-I{os.path.join(sysroot, 'usr', 'include', 'aarch64-linux-gnu')}",
+                ]
+                install_boost_args["cxxflags"] += [
+                    f"--sysroot={sysroot}",
+                    "--target=aarch64-linux-gnu",
+                    f"-I{os.path.join(sysroot, 'usr', 'include', 'aarch64-linux-gnu')}",
+                ]
+                install_boost_args["linkflags"] += [
+                    f"-L{os.path.join(sysroot, 'usr', 'lib', 'aarch64-linux-gnu')}",
+                    f"-B{os.path.join(sysroot, 'usr', 'lib', 'aarch64-linux-gnu')}",
+                ]
+                install_boost_args["architecture"] = "arm"
 
         build_and_install_boost(**install_boost_args)
 
@@ -469,6 +510,7 @@ def install_deps(
     "ubuntu-20.04_x86_64",
     "ubuntu-22.04_x86_64",
     "ubuntu-24.04_x86_64",
+    "ubuntu-24.04_armv8",
     "ios",
     "android",
 ]
@@ -498,6 +540,8 @@ def main():
         platform = Platform("ubuntu", "22.04", "x86_64")
     elif args.target == "ubuntu-24.04_x86_64":
         platform = Platform("ubuntu", "24.04", "x86_64")
+    elif args.target == "ubuntu-24.04_armv8":
+        platform = Platform("ubuntu", "24.04", "armv8")
     elif args.target == "ios":
         platform = Platform("ios", None, None)
     elif args.target == "android":
@@ -572,12 +616,20 @@ def main():
                 cmake_args.append("-DCMAKE_C_COMPILER=clang-18")
                 cmake_args.append("-DCMAKE_CXX_COMPILER=clang++-18")
             else:
+                sysroot = os.path.join(install_dir, "rootfs")
                 cmake_args.append(
                     f"-DCMAKE_C_COMPILER={cmake_path(os.path.join(webrtc_info.clang_dir, 'bin', 'clang'))}"
                 )
                 cmake_args.append(
                     f"-DCMAKE_CXX_COMPILER={cmake_path(os.path.join(webrtc_info.clang_dir, 'bin', 'clang++'))}"
                 )
+                cmake_args.append("-DCMAKE_SYSTEM_NAME=Linux")
+                cmake_args.append("-DCMAKE_SYSTEM_PROCESSOR=aarch64")
+                cmake_args.append(f"-DCMAKE_SYSROOT={sysroot}")
+                cmake_args.append("-DCMAKE_C_COMPILER_TARGET=aarch64-linux-gnu")
+                cmake_args.append("-DCMAKE_CXX_COMPILER_TARGET=aarch64-linux-gnu")
+                cmake_args.append(f"-DCMAKE_FIND_ROOT_PATH={sysroot}")
+                cmake_args.append("-DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER")
             cmake_args.append("-DUSE_LIBCXX=ON")
             cmake_args.append(
                 f"-DLIBCXX_INCLUDE_DIR={cmake_path(os.path.join(webrtc_info.libcxx_dir, 'include'))}"
@@ -684,7 +736,7 @@ def main():
                 os.path.join(sora_build_dir, "bundled", "sora.lib"),
                 os.path.join(install_dir, "sora", "lib", "sora.lib"),
             )
-        elif platform.target.os == "ubuntu":
+        elif platform.target.os == "ubuntu" and platform.target.arch == "x86_64":
             shutil.copyfile(
                 os.path.join(sora_build_dir, "bundled", "libsora.a"),
                 os.path.join(install_dir, "sora", "lib", "libsora.a"),
@@ -776,12 +828,23 @@ def main():
                         cmake_args.append("-DCMAKE_C_COMPILER=clang-18")
                         cmake_args.append("-DCMAKE_CXX_COMPILER=clang++-18")
                     else:
+                        sysroot = os.path.join(install_dir, "rootfs")
                         cmake_args.append(
                             f"-DCMAKE_C_COMPILER={cmake_path(os.path.join(webrtc_info.clang_dir, 'bin', 'clang'))}"
                         )
                         cmake_args.append(
                             f"-DCMAKE_CXX_COMPILER={cmake_path(os.path.join(webrtc_info.clang_dir, 'bin', 'clang++'))}"
                         )
+                        cmake_args.append("-DCMAKE_SYSTEM_NAME=Linux")
+                        cmake_args.append("-DCMAKE_SYSTEM_PROCESSOR=aarch64")
+                        cmake_args.append(f"-DCMAKE_SYSROOT={sysroot}")
+                        cmake_args.append("-DCMAKE_C_COMPILER_TARGET=aarch64-linux-gnu")
+                        cmake_args.append("-DCMAKE_CXX_COMPILER_TARGET=aarch64-linux-gnu")
+                        cmake_args.append(f"-DCMAKE_FIND_ROOT_PATH={sysroot}")
+                        cmake_args.append("-DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER")
+                        cmake_args.append("-DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=BOTH")
+                        cmake_args.append("-DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=BOTH")
+                        cmake_args.append("-DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=BOTH")
                     cmake_args.append("-DUSE_LIBCXX=ON")
                     cmake_args.append(
                         f"-DLIBCXX_INCLUDE_DIR={cmake_path(os.path.join(webrtc_info.libcxx_dir, 'include'))}"