diff --git a/Dockerfile b/Dockerfile
index a0e5046..cc5369e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,9 @@ ENV GOSUMDB=off
 
 
 # Build binary (CGO required for go-fitz/MuPDF bundled static libs)
-RUN go mod download && \
+RUN sed -i 's|https://dl-cdn.alpinelinux.org|https://mirrors.aliyun.com|g' /etc/apk/repositories && \
+    apk add --no-cache gcc musl-dev && \
+    go mod download && \
     CGO_ENABLED=1 GOOS=linux go build -ldflags="-s -w" -o doc_ai ./main.go
 
 # Runtime stage