diff --git a/Dockerfile b/Dockerfile
index 545753c47f..9ceb9a8018 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.2
+# syntax=docker/dockerfile:1
 FROM alpine:3.24
 
 RUN apk add --no-cache --no-progress ca-certificates tzdata
diff --git a/docs/check.Dockerfile b/docs/check.Dockerfile
index 4b9a29b13a..090bd66003 100644
--- a/docs/check.Dockerfile
+++ b/docs/check.Dockerfile
@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 FROM alpine:3.24
 
 RUN apk --no-cache --no-progress add \
diff --git a/docs/docs.Dockerfile b/docs/docs.Dockerfile
index def684750a..715442a4a9 100644
--- a/docs/docs.Dockerfile
+++ b/docs/docs.Dockerfile
@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 FROM alpine:3.24
 
 ENV PATH="${PATH}:/venv/bin"
diff --git a/webui/Dockerfile b/webui/Dockerfile
index 9a9324034d..fb4f0717f3 100644
--- a/webui/Dockerfile
+++ b/webui/Dockerfile
@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 FROM node:24-alpine3.24
 # Current Active LTS release according to (https://nodejs.org/en/about/releases/)