diff --git a/.github/workflows/fedora.yaml b/.github/workflows/fedora.yaml
index cc4a8a4..9975f35 100644
--- a/.github/workflows/fedora.yaml
+++ b/.github/workflows/fedora.yaml
@@ -19,9 +19,8 @@ jobs:
       - name: Prepare
         id: prepare
         run: |
-          DOCKER_IMAGE=ghcr.io/mentos1386/env/fedora
-          #DOCKER_PLATFORMS=linux/amd64,linux/arm/v7,linux/arm64
-          DOCKER_PLATFORMS=linux/amd64,linux/arm64
+          DOCKER_IMAGE=ghcr.io/mentos1386/env-fedora
+          DOCKER_PLATFORMS=linux/amd64,linux/arm/v7,linux/arm64
           VERSION=edge
 
           if [[ $GITHUB_REF == refs/tags/* ]]; then
diff --git a/.github/workflows/ubuntu.yaml b/.github/workflows/ubuntu.yaml
index 6c93f36..eb8c683 100644
--- a/.github/workflows/ubuntu.yaml
+++ b/.github/workflows/ubuntu.yaml
@@ -19,9 +19,8 @@ jobs:
       - name: Prepare
         id: prepare
         run: |
-          DOCKER_IMAGE=ghcr.io/mentos1386/env/ubuntu
-          #DOCKER_PLATFORMS=linux/amd64,linux/arm/v7,linux/arm64
-          DOCKER_PLATFORMS=linux/amd64,linux/arm64
+          DOCKER_IMAGE=ghcr.io/mentos1386/env-ubuntu
+          DOCKER_PLATFORMS=linux/amd64,linux/arm/v7,linux/arm64
           VERSION=edge
 
           if [[ $GITHUB_REF == refs/tags/* ]]; then
diff --git a/Dockerfile.fedora b/Dockerfile.fedora
index fd47f3f..0deaeee 100644
--- a/Dockerfile.fedora
+++ b/Dockerfile.fedora
@@ -6,8 +6,6 @@ LABEL maintainer="Tine <mentos1386> Jozelj <tine@tjo.space>"
 ARG SSH_USER="${SSH_USER:-blink}"
 ARG SSH_PASSWORD="${SSH_PASSWORD:-blink}"
 
-RUN dnf -y update
-
 SHELL ["/bin/bash", "-c"]
 
 RUN set -ueox pipefail \
diff --git a/README.md b/README.md
index 829f7c6..4494090 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,17 @@ my workspace/environment as a docker container
 - [ ] Fedora??
 - [ ] GUI using VNC?
 
+# How to build
+
+```
+$ docker run -it --rm --privileged tonistiigi/binfmt --install all
+
+# ...install buildx
+
+# Build ubuntu for arm64
+$ docker buildx build -f Dockerfile.ubuntu --platform linux/arm64 .
+```
+
 # Introduction
 
 [blink shell](https://blink.sh) is an excellent minimalistic SSH and mosh client