diff --git a/Dockerfile b/Dockerfile
index 87a357150ed4..6656b2005832 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-# syntax = docker/dockerfile:1-experimental
+# syntax=docker/dockerfile:experimental
 
 # Copyright 2018 The Kubernetes Authors.
 #
diff --git a/cmd/example-provider/Dockerfile b/cmd/example-provider/Dockerfile
index 619bae6e83a9..d3ecc0d709a0 100644
--- a/cmd/example-provider/Dockerfile
+++ b/cmd/example-provider/Dockerfile
@@ -1,4 +1,4 @@
-# syntax = docker/dockerfile:1-experimental
+# syntax=docker/dockerfile:experimental
 
 # Copyright 2019 The Kubernetes Authors.
 #
diff --git a/docs/Dockerfile b/docs/Dockerfile
index ea93477283f0..fa1626db9446 100644
--- a/docs/Dockerfile
+++ b/docs/Dockerfile
@@ -1,4 +1,4 @@
-# syntax = docker/dockerfile:1-experimental
+# syntax=docker/dockerfile:experimental
 
 # Copyright 2019 The Kubernetes Authors.
 #
diff --git a/hack/boilerplate/boilerplate.Dockerfile.txt b/hack/boilerplate/boilerplate.Dockerfile.txt
index e885c5e83240..8168b3a2e696 100644
--- a/hack/boilerplate/boilerplate.Dockerfile.txt
+++ b/hack/boilerplate/boilerplate.Dockerfile.txt
@@ -1,4 +1,4 @@
-# syntax = docker/dockerfile:1-experimental
+# syntax=docker/dockerfile:experimental
 
 # Copyright YEAR The Kubernetes Authors.
 #
diff --git a/test/infrastructure/docker/Dockerfile b/test/infrastructure/docker/Dockerfile
index 90c60c823c12..7a9b3dfb10c5 100644
--- a/test/infrastructure/docker/Dockerfile
+++ b/test/infrastructure/docker/Dockerfile
@@ -1,4 +1,4 @@
-# syntax = docker/dockerfile:1-experimental
+# syntax=docker/dockerfile:experimental
 
 # Copyright 2019 The Kubernetes Authors.
 #