diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 86d59039..9f87307b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -245,6 +245,10 @@ 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 install -y software-properties-common multistrap
       - name: Install deps for Android
         if: matrix.platform.os == 'android'
         run: |
diff --git a/run.py b/run.py
index 0aa9f4ac..f60896ef 100644
--- a/run.py
+++ b/run.py
@@ -143,7 +143,7 @@ def install_deps(
         version = read_version_file("VERSION")
 
         # multistrap を使った sysroot の構築
-        if platform.target.arch != "x86_64":
+        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()