diff --git a/Dockerfile b/Dockerfile
index 94bfc4f..56eecb8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,6 +5,8 @@ WORKDIR /app
 RUN apt-get update && apt-get install -y \
     libffi-dev \
     libnacl-dev \
+    libopus0 \
+    ffmpeg \
     python3-dev \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
diff --git a/app.py b/app.py
index f6f6747..4da54d8 100644
--- a/app.py
+++ b/app.py
@@ -1435,14 +1435,15 @@ class GuildMusic:
             audio = discord.FFmpegPCMAudio(stream_url, before_options=FFMPEG_BEFORE_OPTS, options=FFMPEG_OPTS)
             source = discord.PCMVolumeTransformer(audio, volume=self.volume)
             done_evt = asyncio.Event()
+            loop = asyncio.get_running_loop()
 
             def after_play(err):
                 try:
                     if err:
                         logging.warning(f"Player error: {err}")
                 finally:
-                    # Signal to loop that track ended
-                    asyncio.run_coroutine_threadsafe(done_evt.set(), asyncio.get_event_loop())
+                    # Signal to loop that track ended from voice thread
+                    loop.call_soon_threadsafe(done_evt.set)
 
             self.voice.play(source, after=after_play)