diff --git a/Dockerfile b/Dockerfile
index eec32a5..766dbfb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,9 +10,10 @@ RUN npm install -g opencode-ai
 
 # 複製 Node.js 應用程式
 COPY app/ /app/
+WORKDIR /app
 
 # 應用程式無第三方相依套件，僅在有 package-lock 時安裝
-RUN if [ -f /app/package-lock.json ]; then cd /app && npm ci --omit=dev; fi
+RUN if [ -f package-lock.json ]; then npm ci --omit=dev; fi
 
 COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh