diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4dd158ba..eed88475 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -98,7 +98,7 @@ jobs:
           - macos_arm64
           - ios
     name: Build sora-cpp-sdk for ${{ matrix.name }}
-    runs-on: macos-14
+    runs-on: macos-12
     steps:
       - uses: actions/checkout@v4
       - name: Env to output
diff --git a/src/mac/mac_capturer.mm b/src/mac/mac_capturer.mm
index 057936cf..475ff9c3 100644
--- a/src/mac/mac_capturer.mm
+++ b/src/mac/mac_capturer.mm
@@ -94,11 +94,13 @@ - (void)capturer:(RTCVideoCapturer*)capturer
 NSArray<AVCaptureDevice*>* captureDevices() {
 // macOS では USB で接続されたカメラも取得する
 #if defined(SORA_CPP_SDK_MACOS)
-  AVCaptureDeviceDiscoverySession *session = [AVCaptureDeviceDiscoverySession
-  discoverySessionWithDeviceTypes:@[ AVCaptureDeviceTypeBuiltInWideAngleCamera, AVCaptureDeviceTypeExternal ]
-                        mediaType:AVMediaTypeVideo
-                        position:AVCaptureDevicePositionUnspecified];
-   return session.devices;
+  // AVCaptureDeviceTypeExternal の利用には macOS 14 以上が必要だが、 GitHub Actions では macOS 14 が利用出来ないため一時的に古い API を使う
+  // AVCaptureDeviceDiscoverySession *session = [AVCaptureDeviceDiscoverySession
+  // discoverySessionWithDeviceTypes:@[ AVCaptureDeviceTypeBuiltInWideAngleCamera, AVCaptureDeviceTypeExternal ]
+  //                       mediaType:AVMediaTypeVideo
+  //                       position:AVCaptureDevicePositionUnspecified];
+  // return session.devices;
+  return [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
 #else
   return [RTCCameraVideoCapturer captureDevices];
 # endif