diff --git a/containers/debian/base.Dockerfile b/containers/debian/base.Dockerfile
index 0eeb0b1a0b1af949b9b521ad48f1f668990eb8a9..72daa2408daa00fd166e483cffe620c099b93f0f 100644
--- a/containers/debian/base.Dockerfile
+++ b/containers/debian/base.Dockerfile
@@ -1,4 +1,5 @@
-#syntax=docker/dockerfile:1.4
+#syntax=docker/dockerfile:1.8
+#check
 ARG BASE_IMAGE="amd64/debian:stable-slim"
 ARG BUILD_IMAGE="debian_stable_base"
 
diff --git a/containers/jug/dev.Dockerfile b/containers/jug/dev.Dockerfile
index 3dc77bed62d818ea381a7fb9fb9862d8cea4b0ed..ee6c6e02c74813e4d5db4b8026cd37d2a8f949d1 100644
--- a/containers/jug/dev.Dockerfile
+++ b/containers/jug/dev.Dockerfile
@@ -1,4 +1,5 @@
-#syntax=docker/dockerfile:1.4
+#syntax=docker/dockerfile:1.8
+#check
 ARG DOCKER_REGISTRY="eicweb/"
 ARG BUILDER_IMAGE="debian_stable_base"
 ARG RUNTIME_IMAGE="debian_stable_base"