diff --git a/Dockerfile b/Dockerfile
index 8ff0f86c13..7e4e399129 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,6 @@ FROM golang:1.16.6-alpine3.13 AS builder
 
 WORKDIR /usr/local/src/dex
 
-RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.tuna.tsinghua.edu.cn/g' /etc/apk/repositories
 RUN apk add --no-cache --update alpine-sdk
 
 ARG TARGETOS