diff --git a/README.md b/README.md
index 9bfac04..56bb5a0 100644
--- a/README.md
+++ b/README.md
@@ -12,13 +12,14 @@ The following settings are available for configuration by setting the respective
 Verify that the configured settings are suitable for the cluster you want to create the template for.  
 If left unset, the respective default value will be used.
 
-| Variable  | Default                                 | Description                                                            |
-| --------- | --------------------------------------- | ---------------------------------------------------------------------- |
-| `VMID`    | 9023                                    | ID the template should have in Proxmox                                 |
-| `STORAGE` | `local-zfs`                             | Pool the disks should be created in                                    |
-| `OS`      | `debian-12`                             | `virt-builder` name of the OS to install                               |
-| `NAME`    | `chaos-${OS}-tmpl-$(date -u +%Y-%m-%d)` | name of the template                                                   |
-| `BRIDGE`  | `vmbr0,tag=208`                         | name of the bridge to use and any parameters needed, like the VLAN tag |
+| Variable              | Default                                                                                               | Description                                                            |
+| --------------------- | ----------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------- |
+| `VMID`                | 9023                                                                                                  | ID the template should have in Proxmox                                 |
+| `STORAGE`             | `local-zfs`                                                                                           | Pool the disks should be created in                                    |
+| `OS`                  | `debian-12`                                                                                           | `virt-builder` name of the OS to install                               |
+| `NAME`                | `chaos-${OS}-tmpl-$(date -u +%Y-%m-%d)`                                                               | name of the template                                                   |
+| `BRIDGE`              | `vmbr0,tag=208`                                                                                       | name of the bridge to use and any parameters needed, like the VLAN tag |
+| `AUTHORIZED_KEYS_URL` | `https://git.hamburg.ccc.de/CCCHH/infrastructure-authorized-keys/raw/branch/trunk/authorized_keys`    | URL to download the authorized_keys file to use from                   |
 
 ### User Account, sshd, and `authorized_keys`
 
diff --git a/build-proxmox-template b/build-proxmox-template
index b97855c..31d36ea 100755
--- a/build-proxmox-template
+++ b/build-proxmox-template
@@ -10,6 +10,7 @@
 : "${OS:=debian-12}"
 : "${NAME:=chaos-${OS}-tmpl-$(date -u +%Y-%m-%d)}"
 : "${BRIDGE:=vmbr0,tag=208}"
+: "${AUTHORIZED_KEYS_URL:=https://git.hamburg.ccc.de/CCCHH/infrastructure-authorized-keys/raw/branch/trunk/authorized_keys}"
 
 set -eE
 
@@ -27,7 +28,7 @@ cleanup() {
 }
 
 
-wget -4 https://git.hamburg.ccc.de/CCCHH/infrastructure-authorized-keys/raw/branch/trunk/authorized_keys -O authorized_keys
+wget -4 "$AUTHORIZED_KEYS_URL" -O authorized_keys
 wget https://cloud.debian.org/images/cloud/bookworm/latest/debian-12-generic-amd64.tar.xz -O debian-12-generic-amd64.tar.xz
 wget https://cloud.debian.org/images/cloud/bookworm/latest/SHA512SUMS -O SHA512SUMS
 sha512sum --ignore-missing -c SHA512SUMS