diff --git a/Dockerfile b/Dockerfile
index f76dd08..c39b1c3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -35,6 +35,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     libsoup-3.0-dev \
     librsvg2-dev \
     libayatana-appindicator3-dev \
+    # mpv player library (linked via libmpv-sys)
+    libmpv-dev \
     && rm -rf /var/lib/apt/lists/*
 
 # Install Node.js 20.x from NodeSource
diff --git a/Dockerfile.builder b/Dockerfile.builder
index 3a35de3..9471852 100644
--- a/Dockerfile.builder
+++ b/Dockerfile.builder
@@ -33,6 +33,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     libsoup-3.0-dev \
     librsvg2-dev \
     libayatana-appindicator3-dev \
+    # mpv player library (linked via libmpv-sys)
+    libmpv-dev \
     && rm -rf /var/lib/apt/lists/*
 
 # Install Node.js 20.x from NodeSource
diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index d710929..0a404eb 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -14,6 +14,11 @@ edition = "2021"
 name = "jellytau_lib"
 crate-type = ["staticlib", "cdylib", "rlib"]
 
+# Keep debug info minimal to reduce target/ size in CI (line numbers in
+# backtraces are preserved; the bulky full debuginfo is dropped).
+[profile.dev]
+debug = "line-tables-only"
+
 [build-dependencies]
 tauri-build = { version = "2", features = [] }