diff --git a/caddy/Dockerfile b/caddy/Dockerfile
index d8da934d..42e4231b 100644
--- a/caddy/Dockerfile
+++ b/caddy/Dockerfile
@@ -1,4 +1,4 @@
-FROM caddy:2.2.1
+FROM caddy:2.4.0
 
 ARG USE_SJTUG
 RUN if [ "$USE_SJTUG" = true ] ; then sed -i 's/http:\/\/dl-cdn.alpinelinux.org/http:\/\/mirrors.ustc.edu.cn/g' /etc/apk/repositories ; fi