diff --git a/Dockerfile b/Dockerfile
index 414f669..bea44cb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,9 @@
-FROM alpine:3.16 AS builder
+FROM alpine:3.18 AS builder
 COPY ./squid-preload.c /tmp/squid-preload.c
 RUN apk add --no-cache gcc musl-dev && \
     gcc -fPIC -O3 -shared -Wl,-export-dynamic -o /tmp/squid-preload.so /tmp/squid-preload.c -lc
 
-FROM smartentry/alpine:3.16
+FROM smartentry/alpine:3.18
 
 MAINTAINER Yifan Gao <docker@yfgao.com>