diff --git a/Dockerfile b/Dockerfile
index 2ec0c40..433fb3e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,8 @@ FROM debian:buster-slim
 ARG TARGETPLATFORM
 ARG DEBIAN_FRONTEND=noninteractive
 
-RUN apt-get update && \
+RUN echo 'deb http://deb.debian.org/debian buster-backports main' > /etc/apt/sources.list.d/buster-backports.list && \
+    apt-get update && \
     apt-get install -y locales && \
     localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8
 ENV LANG=en_US.utf8
@@ -18,7 +19,7 @@ RUN apt-get install --no-install-recommends -y \
         python3-setuptools python3-wheel python3-yaml python3-distro python3-jsonschema \
         gosu lsb-release file vim less procps tree tar bzip2 zstd bc tmux libncurses-dev \
         dosfstools mtools parted \
-        git-lfs mercurial iproute2 ssh-client curl rsync gnupg awscli sudo && \
+        git-lfs/buster-backports mercurial iproute2 ssh-client curl rsync gnupg awscli sudo && \
     if [ "$TARGETPLATFORM" = "linux/amd64" ]; then \
         apt-get install --no-install-recommends -y gcc-multilib syslinux; \
     fi && \
diff --git a/Dockerfile.isar b/Dockerfile.isar
index 62a5f00..95fb81c 100644
--- a/Dockerfile.isar
+++ b/Dockerfile.isar
@@ -7,8 +7,7 @@ FROM ghcr.io/siemens/kas/kas:$KAS_TAG
 ARG DEBIAN_FRONTEND=noninteractive
 
 ENV LC_ALL=en_US.UTF-8
-RUN echo 'deb http://deb.debian.org/debian buster-backports main' > /etc/apt/sources.list.d/buster-backports.list && \
-    echo 'deb http://deb.debian.org/debian bullseye main' > /etc/apt/sources.list.d/bullseye.list && \
+RUN echo 'deb http://deb.debian.org/debian bullseye main' > /etc/apt/sources.list.d/bullseye.list && \
     echo "Package: skopeo golang-github-containers-common golang-github-containers-image\nPin: release n=bullseye\nPin-Priority: 501\n\nPackage: *\nPin: release n=bullseye\nPin-Priority: -1" > /etc/apt/preferences.d/skopeo && \
     apt-get update && \
     apt-get install -y -f --no-install-recommends \