diff --git a/Dockerfile b/Dockerfile
index eda0356..5aa3dba 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ ARG CADDYDEFENDER_VERSION=v0.8.5
 # renovate: datasource=github-releases depName=caddy-dns/rfc2136
 ARG CADDYRFC2136_VERSION=v1.0.0
 
-FROM caddy:2.9.1-builder-alpine@sha256:77a6376a7f8074e856ffdb339054d28b93bd6cc68c82e34b675b0b39b1a25689 AS builder
+FROM caddy:2.9.1-builder-alpine@sha256:0d51ab53402e144be9cab449f5adfec681b87d481dcd175230813427d5e00f00 AS builder
 
 RUN xcaddy build \
     --with github.com/caddy-dns/rfc2136@${CADDYRFC2136_VERSION} \