diff --git a/caddy/Dockerfile b/caddy/Dockerfile
index 18bb2ac..fadb966 100644
--- a/caddy/Dockerfile
+++ b/caddy/Dockerfile
@@ -1,4 +1,4 @@
-FROM caddy:builder AS builder
+FROM caddy:2.9-builder AS builder
 
 RUN xcaddy build \
     --with github.com/caddyserver/nginx-adapter \