diff --git a/packer/debian_bullseye.qemu.json b/packer/debian_bullseye.qemu.json
index a25f1a7..085a225 100644
--- a/packer/debian_bullseye.qemu.json
+++ b/packer/debian_bullseye.qemu.json
@@ -1,72 +1,72 @@
 {
   "variables": {
     "DISK_SIZE": "20480",
     "IMAGE_TIMESTAMP": "{{isotime \"20060102-1504\"}}",
-    "PACKER_BOX_NAME": "swh-debian-11.3-amd64-{{ user `IMAGE_TIMESTAMP` }}"
+    "PACKER_BOX_NAME": "swh-debian-11.4-amd64-{{ user `IMAGE_TIMESTAMP` }}"
   },
   "builders": [
     {
       "headless": false,
       "type": "qemu",
       "format": "qcow2",
       "accelerator": "kvm",
       "net_device": "virtio-net",
       "disk_interface": "virtio",
       "memory": 2048,
       "cpus": 2,
 
       "boot_command": [
         "<esc><wait>",
         "install <wait>",
         "preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed.cfg <wait>",
         "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
         "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
         "netcfg/get_domain=vagrantup.com <wait>",
         "fb=false <wait>",
         "debconf/frontend=noninteractive <wait>",
         "console-setup/ask_detect=false <wait>",
         "console-keymaps-at/keymap=us <wait>",
         "grub-installer/bootdev=/dev/vda <wait>",
         "<enter><wait>"
       ],
 
       "boot_wait": "5s",
       "disk_size": "{{ user `DISK_SIZE` }}",
       "ssh_username": "vagrant",
       "ssh_password": "vagrant",
       "ssh_port": 22,
       "ssh_wait_timeout": "1000s",
       "output_directory": "output",
       "http_directory": "http",
       "iso_urls": [
-        "https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-11.3.0-amd64-netinst.iso"
+        "https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-11.4.0-amd64-netinst.iso"
       ],
-      "iso_checksum": "7892981e1da216e79fb3a1536ce5ebab157afdd20048fe458f2ae34fbc26c19b",
+      "iso_checksum": "d490a35d36030592839f24e468a5b818c919943967012037d6ab3d65d030ef7f",
       "shutdown_command": "echo 'vagrant'|sudo -S shutdown -P now",
       "vm_name": "{{ user `PACKER_BOX_NAME` }}"
     }],
   "provisioners": [
     {
       "type": "shell",
       "expect_disconnect": "true",
       "execute_command": "echo 'vagrant'|{{.Vars}} sudo -S -E bash '{{.Path}}'",
       "scripts": [
         "scripts/post-install.sh"
       ]
     }
   ],
 
   "post-processors": [
     [
       {
         "type": "vagrant",
         "compression_level": 9,
         "output": "builds/{{ user `PACKER_BOX_NAME` }}.qcow2"
       }
     ]
   ]
 }
diff --git a/packer/debian_bullseye_zfs.qemu.json b/packer/debian_bullseye_zfs.qemu.json
index 0716a67..8424b42 100644
--- a/packer/debian_bullseye_zfs.qemu.json
+++ b/packer/debian_bullseye_zfs.qemu.json
@@ -1,80 +1,80 @@
 {
   "variables": {
     "DISK_SIZE": "20480",
     "IMAGE_TIMESTAMP": "{{isotime \"20060102-1504\"}}",
-    "PACKER_BOX_NAME": "swh-debian-zfs-11.3-amd64-{{ user `IMAGE_TIMESTAMP` }}"
+    "PACKER_BOX_NAME": "swh-debian-zfs-11.4-amd64-{{ user `IMAGE_TIMESTAMP` }}"
   },
   "builders": [
     {
       "headless": false,
       "type": "qemu",
       "format": "qcow2",
       "accelerator": "kvm",
       "net_device": "virtio-net",
       "disk_interface": "virtio",
       "memory": 2048,
       "cpus": 2,
 
       "boot_command": [
         "<esc><wait>",
         "install <wait>",
         "preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed.cfg <wait>",
         "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
         "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
         "netcfg/get_domain=vagrantup.com <wait>",
         "fb=false <wait>",
         "debconf/frontend=noninteractive <wait>",
         "console-setup/ask_detect=false <wait>",
         "console-keymaps-at/keymap=us <wait>",
         "grub-installer/bootdev=/dev/vda <wait>",
         "<enter><wait>"
       ],
 
       "boot_wait": "5s",
       "disk_size": "{{ user `DISK_SIZE` }}",
       "ssh_username": "vagrant",
       "ssh_password": "vagrant",
       "ssh_port": 22,
       "ssh_wait_timeout": "1000s",
       "output_directory": "output",
       "http_directory": "http",
       "iso_urls": [
-        "https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-11.3.0-amd64-netinst.iso"
+        "https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-11.4.0-amd64-netinst.iso"
       ],
-      "iso_checksum": "7892981e1da216e79fb3a1536ce5ebab157afdd20048fe458f2ae34fbc26c19b",
+      "iso_checksum": "d490a35d36030592839f24e468a5b818c919943967012037d6ab3d65d030ef7f",
       "shutdown_command": "echo 'vagrant'|sudo -S shutdown -P now",
       "vm_name": "{{ user `PACKER_BOX_NAME` }}"
     }],
   "provisioners": [
     {
       "type": "shell",
       "expect_disconnect": "true",
       "execute_command": "echo 'vagrant'|{{.Vars}} sudo -S -E bash '{{.Path}}'",
       "scripts": [
         "scripts/post-install.sh"
       ]
     },
     {
       "type": "shell",
       "expect_disconnect": "true",
       "execute_command": "echo 'vagrant'|{{.Vars}} sudo -S -E bash '{{.Path}}'",
       "scripts": [
         "scripts/post-install-extra.sh"
       ]
     }
   ],
 
   "post-processors": [
     [
       {
         "type": "vagrant",
         "compression_level": 9,
         "output": "builds/{{ user `PACKER_BOX_NAME` }}.qcow2"
       }
     ]
   ]
 }
diff --git a/packer/scripts/post-install.sh b/packer/scripts/post-install.sh
index 3468478..98bb89a 100644
--- a/packer/scripts/post-install.sh
+++ b/packer/scripts/post-install.sh
@@ -1,70 +1,72 @@
 #!/bin/bash -eu
 
 ####
 # apt configuration
 ####
 source /etc/os-release
 cat <<EOF >/etc/apt/sources.list.d/debian.list
 deb http://deb.debian.org/debian ${VERSION_CODENAME} main
 deb-src http://deb.debian.org/debian ${VERSION_CODENAME} main
 
 deb http://deb.debian.org/debian ${VERSION_CODENAME}-updates main
 deb-src http://deb.debian.org/debian ${VERSION_CODENAME}-updates main
 EOF
 
 export DEBIAN_FRONTEND=noninteractive
 
 apt-get update
+apt-get upgrade -y
+
 apt-get install -y man wget curl telnet net-tools dnsutils traceroute unbound gpg
 
 ####
 # allow vagrant user to sudo to root without password
 ####
 cat <<EOF >/etc/sudoers.d/vagrant
 vagrant ALL= NOPASSWD: ALL
 EOF
 chmod 0440 /etc/sudoers.d/vagrant
 
 ####
 # Configure authorized_keys to allow vagrant command line to interact with the VM
 ####
 mkdir -m 700 /home/vagrant/.ssh
 curl -s https://raw.githubusercontent.com/hashicorp/vagrant/master/keys/vagrant.pub >> /home/vagrant/.ssh/authorized_keys
 chmod 0600 /home/vagrant/.ssh/authorized_keys
 chown -R vagrant:vagrant /home/vagrant/.ssh
 
 ####
 # Puppet
 ####
 apt-get install -y puppet
 
 # Configure the fileserver for the "le_certs" share
 # In the vm, this directory is a mount of the vagrant/le_certs directory configured on the vagrantfile
 mkdir -p /var/lib/puppet/letsencrypt_exports
 cat > /etc/puppet/fileserver.conf <<EOF
 [le_certs]
   path /var/lib/puppet/letsencrypt_exports
   allow *
 EOF
 
 ####
 # Boot config
 ####
 # Restore the dirty default interface naming
 # The default behavior can't be used as the mac address of the interfaces
 # are changed for each instanciation of this image
 sed -i 's|^GRUB_CMDLINE_LINUX="\(.*\)"|GRUB_CMDLINE_LINUX="\1 net.ifnames=0 biosdevname=0"|' /etc/default/grub
 grub-mkconfig -o /boot/grub/grub.cfg
 
 # configure default interfaces
 cat > /etc/network/interfaces <<EOF
 source /etc/network/interfaces.d/*
 
 # The loopback network interface
 auto lo
 iface lo inet loopback
 
 # The primary network interface
 allow-hotplug eth0
 iface eth0 inet dhcp
 EOF