diff --git a/Dockerfile b/Dockerfile
index c51321e..e13e930 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,6 @@
 # ---- Build stage ----------------------------------------------------------
-FROM node:20-alpine AS builder
+# Pin the registry explicitly to avoid internal mirror DNS issues during build.
+FROM docker.io/library/node:20-alpine AS builder
 
 WORKDIR /app
 
@@ -10,7 +11,7 @@ COPY src/ ./src/
 RUN npm run build
 
 # ---- Runtime stage --------------------------------------------------------
-FROM node:20-alpine
+FROM docker.io/library/node:20-alpine
 
 WORKDIR /app
 
@@ -28,4 +29,4 @@ USER app
 
 EXPOSE 3012
 
-CMD ["node", "server.js"]
\ No newline at end of file
+CMD ["node", "server.js"]\n
\ No newline at end of file