diff --git a/fuellog-api/Dockerfile b/fuellog-api/Dockerfile
index 093259b..8df6c95 100644
--- a/fuellog-api/Dockerfile
+++ b/fuellog-api/Dockerfile
@@ -1,6 +1,8 @@
 # 多阶段构建:builder 出静态二进制,runner 极简
 # Builder
-FROM golang:1.22-alpine AS builder
+# 注:go.mod 的 go 指令是 1.26.0(本机 go mod tidy 用 Go 1.27 写入),
+# base image 必须 >= 1.26,否则 go mod download 会因 GOTOOLCHAIN=local 失败
+FROM golang:1.27-alpine AS builder
 
 # 国内构建场景下可换成 aliyun / tencent 镜像
 # RUN sed -i 's|dl-cdn.alpinelinux.org|mirrors.aliyun.com|g' /etc/apk/repositories