diff --git a/contrib/docker/Dockerfile b/contrib/docker/Dockerfile
index 842081ad..64679fc7 100755
--- a/contrib/docker/Dockerfile
+++ b/contrib/docker/Dockerfile
@@ -1,6 +1,6 @@
 ARG BASE_IMAGE
 
-FROM $BASE_IMAGE as build
+FROM $BASE_IMAGE AS build
 
 RUN apt-get update && apt-get install -y \
     knxd-dev knxd- libmosquitto-dev libssl-dev libstdc++6 libc6 libgcc1 \
@@ -25,7 +25,7 @@ RUN RUNTEST=full GIT_REVISION=$GIT_REVISION ./make_debian.sh --with-knxd
 
 
 
-FROM $BASE_IMAGE-slim as image
+FROM $BASE_IMAGE-slim AS image
 
 RUN apt-get update && apt-get install -y \
     knxd-dev knxd- libmosquitto1 libssl1.1 ca-certificates libstdc++6 libc6 libgcc1 \
diff --git a/contrib/docker/Dockerfile.release b/contrib/docker/Dockerfile.release
index e63142d3..2ae41172 100644
--- a/contrib/docker/Dockerfile.release
+++ b/contrib/docker/Dockerfile.release
@@ -1,6 +1,6 @@
 ARG BASE_IMAGE
 
-FROM $BASE_IMAGE as build
+FROM $BASE_IMAGE AS build
 
 RUN apt-get update && apt-get install -y \
     libmosquitto-dev libssl-dev libstdc++6 libc6 libgcc1 \
@@ -25,7 +25,7 @@ RUN GIT_REVISION=$GIT_REVISION ./make_debian.sh
 
 
 
-FROM $BASE_IMAGE-slim as image
+FROM $BASE_IMAGE-slim AS image
 
 RUN apt-get update && apt-get install -y \
     libmosquitto1 libssl1.1 ca-certificates libstdc++6 libc6 libgcc1 \
diff --git a/contrib/docker/Dockerfile.template b/contrib/docker/Dockerfile.template
index 5f0a717f..7d384f64 100644
--- a/contrib/docker/Dockerfile.template
+++ b/contrib/docker/Dockerfile.template
@@ -1,6 +1,6 @@
 ARG BASE_IMAGE
 
-FROM $BASE_IMAGE as build
+FROM $BASE_IMAGE AS build
 
 RUN apt-get update && apt-get install -y \
     %EBUSD_EXTRAPKGS%libmosquitto-dev libssl-dev libstdc++6 libc6 libgcc1 \
@@ -25,7 +25,7 @@ RUN %EBUSD_MAKE%
 %EBUSD_UPLOAD_LINES%
 
 
-FROM $BASE_IMAGE-slim as image
+FROM $BASE_IMAGE-slim AS image
 
 RUN apt-get update && apt-get install -y \
     %EBUSD_EXTRAPKGS%libmosquitto1 libssl1.1 ca-certificates libstdc++6 libc6 libgcc1 \