diff --git a/Dockerfile b/Dockerfile
index c242d4e..fba9b7c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-# syntax = docker/dockerfile:1.5.2
+# syntax = docker/dockerfile:1.9.0
 # tag needed for riscv64 support
 FROM --platform=$BUILDPLATFORM alpine:3.19 AS httpd_git