diff --git a/Dockerfile b/Dockerfile
index 5fc86069e..c46bd3770 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,7 @@
-FROM golang:1.20.6-alpine3.18 as builder
+FROM golang:1.21.0-alpine3.18 as builder
 MAINTAINER xtaci <daniel820313@gmail.com>
 ENV GO111MODULE=on
-RUN apk update && \
-    apk upgrade && \
-    apk add git gcc libc-dev linux-headers
+RUN apk add git
 RUN git clone https://github.com/xtaci/kcptun.git
 RUN cd kcptun && \
 	go build -mod=vendor -ldflags "-X main.VERSION=$(date -u +%Y%m%d) -s -w" -o /client github.com/xtaci/kcptun/client && \