diff --git a/Dockerfile b/Dockerfile
index 7150b0a..d70cdcb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,5 @@
-ARG TARGETOS=linux
-ARG TARGETARCH=amd64
-
-FROM registry.cn-shenzhen.aliyuncs.com/yuntuo_tools/golang:1.27.1-alpine AS build
+# The pinned compiler image is amd64; Go cross-compiles each target selected by BuildKit.
+FROM --platform=linux/amd64 registry.cn-shenzhen.aliyuncs.com/yuntuo_tools/golang:1.27.1-alpine@sha256:81b9f1f3d11530b7609dd3e9dd0dbd383511dd605dce7e25b37c39da19998bb9 AS build
 
 ARG TARGETOS
 ARG TARGETARCH