diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f565e7b..a4fd236 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -6,12 +6,6 @@ on:
     - cron:  '51 2 * * 0'
 jobs:
   images:
-    strategy:
-      fail-fast: false
-      matrix:
-        tag:
-          - nixos-22.11
-          - nixos-unstable
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
@@ -19,6 +13,6 @@ jobs:
       with:
         nix_path: nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz
     - name: Build image
-      run: ./build-images.sh "${{matrix.tag}}"
+      run: ./build-images.sh
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/README.md b/README.md
index 7acb3e5..de900af 100644
--- a/README.md
+++ b/README.md
@@ -19,11 +19,6 @@ count) in the system. If not enough RAM is available, the initrd cannot be
 loaded. Because the NixOS runs only in RAM, users can reformat all the system's
 discs to prepare for a new NixOS installation.
 
-Currently, there are two variants of kexec: [nixos-kexec-installer](https://github.com/nix-community/nixos-images/releases/download/nixos-unstable/nixos-kexec-installer-x86_64-linux.tar.xz)
-and [kexec bundle](https://github.com/nix-community/nixos-images/releases/download/nixos-unstable/kexec-bundle-x86_64-linux).
-
-The nixos-kexec-installer tarball is the new preferred method.
-
 It can be booted as follows by running these commands as root:
 
 ```
@@ -44,7 +39,3 @@ The actual kexec happens with a slight delay (6s).  This allows for easier
 integration into automated nixos installation scripts, since you can cleanly
 disconnect from the running machine before the kexec takes place.  The tarball
 is also designed to be run from NixOS, which can be useful for new installations
-
-We also have [kexec-bundle](https://github.com/nix-community/nixos-images/releases/download/nixos-unstable/kexec-bundle-x86_64-linux),
-which is a self-extracting archive from [nixos-generators](https://github.com/nix-community/nixos-generators). 
-This version unpacks itself to `/` and possibly overlays the existing `/nix/store` with its own files.
diff --git a/build-images.sh b/build-images.sh
index 5bc47c5..b80ec9c 100755
--- a/build-images.sh
+++ b/build-images.sh
@@ -1,12 +1,12 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -p nixos-generators -p nix -p coreutils -p bash -p gh -i bash
+#!nix-shell -p nix -p coreutils -p bash -p gh -i bash
 # shellcheck shell=bash
 set -xeuo pipefail
 shopt -s lastpipe
 
 build_netboot_image() {
   declare -r tag=$1 arch=$2 tmp=$3
-  img=$(nix-build --no-out-link -I "nixpkgs=https://github.com/NixOS/nixpkgs/archive/${tag}.tar.gz" '<nixpkgs/nixos/release.nix>' -A "netboot.$arch")
+  img=$(nix build --print-out-paths --option accept-flake-config true -L ".#packages.${arch}.netboot-${tag//.}")
   ln -s "$img/bzImage" "$tmp/bzImage-$arch"
   echo "$tmp/bzImage-$arch"
   ln -s "$img/initrd" "$tmp/initrd-$arch"
@@ -19,19 +19,9 @@ build_netboot_image() {
   echo "$tmp/netboot-$arch.ipxe"
 }
 
-build_kexec_bundle() {
-  declare -r tag=$1 arch=$2 tmp=$3
-  # the default configuration conflicts with the kexec bundle configuration
-  echo "{}" > "$tmp/config.nix"
-  nixos-generate -o "$tmp/kexec-bundle-$arch" -c "$tmp/config.nix" -f kexec-bundle -I "nixpkgs=https://github.com/NixOS/nixpkgs/archive/${tag}.tar.gz" >/dev/null
-  echo "$tmp/kexec-bundle-$arch"
-}
-
 build_kexec_installer() {
   declare -r tag=$1 arch=$2 tmp=$3
-  # run the test once we have kvm support in github actions
-  # ignore=$(nix-build ./nix/kexec-installer/test.nix -I "nixpkgs=https://github.com/NixOS/nixpkgs/archive/${tag}.tar.gz" --argstr system "$arch")
-  out=$(nix-build '<nixpkgs/nixos>' -o "$tmp/kexec-installer-$arch" -I nixos-config=./nix/kexec-installer/module.nix -I "nixpkgs=https://github.com/NixOS/nixpkgs/archive/${tag}.tar.gz" --argstr system "$arch" -A config.system.build.kexecTarball)
+  out=$(nix build --print-out-paths --option accept-flake-config true -L ".#packages.${arch}.kexec-installer-${tag//.}")
   echo "$out/nixos-kexec-installer-$arch.tar.gz"
 }
 
@@ -41,7 +31,6 @@ main() {
   trap 'rm -rf -- "$tmp"' EXIT
   (
     build_kexec_installer "$tag" "$arch" "$tmp"
-    build_kexec_bundle "$tag" "$arch" "$tmp"
     build_netboot_image "$tag" "$arch" "$tmp"
   ) | readarray -t assets
   for asset in "${assets[@]}"; do
diff --git a/flake.nix b/flake.nix
index 72e1dec..fe86fd9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,9 +14,12 @@
   outputs = { self, nixos-unstable, nixos-2211 }: {
     packages.x86_64-linux = let
       netboot = nixpkgs: (import (nixpkgs + "/nixos/release.nix") {}).netboot.x86_64-linux;
+      kexec-installer = nixpkgs: (nixpkgs.legacyPackages.x86_64-linux.nixos [self.nixosModules.kexec-installer]).config.system.build.kexecTarball;
     in {
-      netboot-unstable = netboot nixos-unstable;
-      netboot-2211 = netboot nixos-2211;
+      netboot-nixos-unstable = netboot nixos-unstable;
+      netboot-nixos-nixos-2211 = netboot nixos-2211;
+      kexec-installer-nixos-unstable = kexec-installer nixos-unstable;
+      kexec-installer-nixos-2211 = kexec-installer nixos-2211;
     };
     nixosModules.kexec-installer = import ./nix/kexec-installer/module.nix;
     checks.x86_64-linux = {