diff --git a/Dockerfile b/Dockerfile
index df1af7c..e083f4a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,6 +2,13 @@ FROM python:3.11-alpine
 
 WORKDIR /app
 
+# Audio stack: libmpv for python-mpv, ffmpeg for MP3 waveform, libsndfile for soundfile
+RUN apk add --no-cache \
+    mpv-libs \
+    ffmpeg \
+    ffmpeg-libs \
+    libsndfile
+
 COPY pyproject.toml .
 RUN pip install --no-cache-dir .
 
diff --git a/pyproject.toml b/pyproject.toml
index 9dea7fb..73f8522 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,6 +13,9 @@ dependencies = [
     "aiofiles>=24.0.0",
     "python-dotenv>=1.0.0",
     "structlog>=24.0.0",
+    "python-mpv>=1.0.5",
+    "soundfile>=0.12.0",
+    "numpy>=1.26.0",
 ]
 
 [project.optional-dependencies]