diff --git a/.github/workflows/build-osx-wizmode.yml b/.github/workflows/build-osx-wizmode.yml
index aa3f6657e..57af67cd6 100644
--- a/.github/workflows/build-osx-wizmode.yml
+++ b/.github/workflows/build-osx-wizmode.yml
@@ -14,7 +14,7 @@ env:
 jobs:
   build:
     # custom libpng build fails a test on macos-latest (11.x)
-    runs-on: macos-13
+    runs-on: macos-15-intel
     steps:
       - uses: actions/checkout@v2
         with:
diff --git a/audio/RtMidi.cpp b/audio/RtMidi.cpp
index fc4a3aa0c..3b28f84aa 100644
--- a/audio/RtMidi.cpp
+++ b/audio/RtMidi.cpp
@@ -1032,9 +1032,10 @@ void MidiOutCore :: sendMessage( std::vector<unsigned char> *message )
     return;
   }
 
-  Byte buffer[nBytes+(sizeof(MIDIPacketList))];
-  ByteCount listSize = sizeof(buffer);
-  MIDIPacketList *packetList = (MIDIPacketList*)buffer;
+  // Replace the buffer VLA with a std::vector-based buffer to avoid VLA.
+  std::vector<Byte> bufferVec(nBytes + sizeof(MIDIPacketList));
+  ByteCount listSize = static_cast<ByteCount>(bufferVec.size());
+  MIDIPacketList *packetList = reinterpret_cast<MIDIPacketList*>(bufferVec.data());
   MIDIPacket *packet = MIDIPacketListInit( packetList );
 
   ByteCount remainingBytes = nBytes;