diff --git a/Dockerfile b/Dockerfile
index 147e293..38067f4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM caddy:2.8.4-builder-alpine@sha256:98bd4545236c1aae8afab0eca255903487925e92ca06f14accf7e9ca607a163e AS builder
+FROM caddy:2.8.4-builder-alpine@sha256:edc6e5121f18919c8f0acb4c578a271ce1806d1a5f0bfd15180b17eedcccd793 AS builder
 
 RUN xcaddy build \
     --with github.com/caddy-dns/rfc2136@master