diff --git a/docker/Dockerfile b/docker/Dockerfile
index 91bf8c09..d68f4312 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.8
+# syntax=docker/dockerfile:1.9
 FROM debian:12-slim
 
 LABEL maintainer="NGINX Docker Maintainers <integrations@nginx.com>"