diff --git a/Vagrantfile b/Vagrantfile
index e028556..d563467 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -59,7 +59,7 @@ Vagrant.configure("2") do |config|
 
   config.vm.define "vm4" do |vm4|
     vm4.vm.network "private_network", ip: "192.168.56.5"
-    vm4.vm.box = "debian/bullseye64"
+    vm4.vm.box = "debian/bookworm64"
     vm4.vm.provider "virtualbox" do |vb|
       vb.memory = "512"
       vb.cpus = 1