diff --git a/Dockerfile b/Dockerfile
index c922ba9..9a4e38e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1
+
 FROM ghcr.io/linuxserver/baseimage-kasmvnc:ubuntunoble
 
 # set version label
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index 4a10d07..c17bb76 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1
+
 FROM ghcr.io/linuxserver/baseimage-kasmvnc:arm64v8-ubuntunoble
 
 # set version label