diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 268f834..bb59a3f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,14 +3,18 @@ stages:
 
 variables:
   IMAGE_NAME: thallian/alpine-s6
-  CI_BUILD_ARCHS: "linux/amd64,linux/arm64"
   DOWNSTREAM_PROJECTS: "11 12 14 15 17 18"
 
 build:
   stage: build
   script:
     - docker login -u $DOCKER_USER -p $DOCKER_PASSWORD $DOCKER_REGISTRY
-    - docker buildx build --platform "$CI_BUILD_ARCHS" --progress plain --pull --tag "$IMAGE_NAME:$CI_COMMIT_SHA" --tag "$IMAGE_NAME:$CI_COMMIT_REF_NAME" --tag "$IMAGE_NAME:latest" --push .
+    - docker build -t $IMAGE_NAME:$CI_COMMIT_SHA .
+    - docker build -t $IMAGE_NAME:$CI_COMMIT_REF_NAME .
+    - docker build -t $IMAGE_NAME:latest .
+    - docker push $IMAGE_NAME:$CI_COMMIT_SHA
+    - docker push $IMAGE_NAME:$CI_COMMIT_REF_NAME
+    - docker push $IMAGE_NAME:latest
     - |
       for proj in $DOWNSTREAM_PROJECTS; do
         curl --request POST --form "token=$CI_JOB_TOKEN" --form ref=master $CI_API_V4_URL/projects/$proj/trigger/pipeline
diff --git a/Dockerfile b/Dockerfile
index f4ffd59..524cca2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,19 +3,19 @@ LABEL maintainer="Sebastian Hugentobler <sebastian@vanwa.ch>"
 
 ARG TARGETPLATFORM
 
-ENV S6_OVERLAY_VERSION=v3.0.0.2
-ENV SHA256_amd64=a4c039d1515812ac266c24fe3fe3c00c48e3401563f7f11d09ac8e8b4c2d0b0c
-ENV SHA256_aarch64=e6c15e22dde00af4912d1f237392ac43a1777633b9639e003ba3b78f2d30eb33
+ENV S6_OVERLAY_VERSION=3.0.0.2
+ENV SHA256_SUM=a4c039d1515812ac266c24fe3fe3c00c48e3401563f7f11d09ac8e8b4c2d0b0c
 
 RUN apk --no-cache add \
     bash
 
-ADD fetch-platform-rootfs /
-RUN ./fetch-platform-rootfs
-RUN mkdir /overlay
-RUN tar -xvf s6-overlay.tar.gz -C /overlay
+RUN wget "https://github.com/just-containers/s6-overlay/releases/download/v$S6_OVERLAY_VERSION/s6-overlay-x86_64-$S6_OVERLAY_VERSION.tar.xz"
+RUN echo "$SHA256_SUM  s6-overlay-x86_64-$S6_OVERLAY_VERSION.tar.xz" | sha256sum -c - || exit 1
 
-FROM alpine:3.14
+RUN mkdir /overlay
+RUN tar -xvf s6-overlay-x86_64-$S6_OVERLAY_VERSION.tar.xz -C /overlay
+
+FROM alpine:3.15
 
 ENV LANG=en_US.UTF-8
 
diff --git a/fetch-platform-rootfs b/fetch-platform-rootfs
deleted file mode 100755
index a868efb..0000000
--- a/fetch-platform-rootfs
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/usr/bin/env bash
-set -ex
-
-case $TARGETPLATFORM in
-	linux-arm64)
-		ARCH=aarch64
-		;;
-	*)
-		ARCH=amd64
-		;;
-  esac
-
-DOWNLOAD="https://github.com/just-containers/s6-overlay/releases/download/$S6_OVERLAY_VERSION/s6-overlay-$ARCH.tar.xz"
-wget "$DOWNLOAD"
-
-sha256_name=SHA256_$ARCH && echo "${!sha256_name}  /s6-overlay-$ARCH.tar.xz" | sha256sum -c - || exit 1
-mv /s6-overlay-$ARCH.tar.xz /s6-overlay.tar.xz