diff --git a/Dockerfile b/Dockerfile
index 068f075..ef1ead3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM caddy:2.9.1-builder-alpine@sha256:e691e045fccb5d6d411dad22ab15860b00d6aabea521363969fa42f0aab5154b AS builder
+FROM caddy:2.9.1-builder-alpine@sha256:c473c15a6761701625f62438b87fdc95d7f25a278e4df0043c4efc5ee092f4af AS builder
 
 RUN xcaddy build \
     --with github.com/caddy-dns/rfc2136@master