diff --git a/docs/examples/full-example.md b/docs/examples/full-example.md
index 08f259b7..1da7a853 100644
--- a/docs/examples/full-example.md
+++ b/docs/examples/full-example.md
@@ -69,7 +69,7 @@ cluster:
       privateKeyPath: "~/.ssh/id_rsa_test"
       addToKnownHosts: true
     os:
-      distro: ubuntu
+      distro: ubuntu22
       networkInterface: ens3 # (20)!
     dns: # (21)!
       - 1.1.1.1
diff --git a/docs/examples/ha-cluster.md b/docs/examples/ha-cluster.md
index cb4a072f..b0d8b9d0 100644
--- a/docs/examples/ha-cluster.md
+++ b/docs/examples/ha-cluster.md
@@ -260,7 +260,7 @@ cluster:
         ssh:
           addToKnownHosts: true
         os:
-          distro: ubuntu
+          distro: ubuntu22
       nodes:
         loadBalancer:
           vip: 10.10.13.200
diff --git a/docs/examples/multi-master-cluster.md b/docs/examples/multi-master-cluster.md
index 090d529e..c97b31b6 100644
--- a/docs/examples/multi-master-cluster.md
+++ b/docs/examples/multi-master-cluster.md
@@ -99,7 +99,7 @@ The load balancer is then configured to distribute traffic received on port 6443
         ssh:
           addToKnownHosts: true
         os:
-          distro: ubuntu
+          distro: ubuntu22
       nodes:
         loadBalancer:
           instances:
diff --git a/docs/examples/multi-worker-cluster.md b/docs/examples/multi-worker-cluster.md
index 6171acba..1e4dc705 100644
--- a/docs/examples/multi-worker-cluster.md
+++ b/docs/examples/multi-worker-cluster.md
@@ -70,7 +70,7 @@ cluster:
         ssh:
           addToKnownHosts: true
         os:
-          distro: ubuntu
+          distro: ubuntu22
       nodes:
         master:
           instances:
diff --git a/docs/examples/rook-cluster.md b/docs/examples/rook-cluster.md
index 6b1f8796..77beccea 100644
--- a/docs/examples/rook-cluster.md
+++ b/docs/examples/rook-cluster.md
@@ -103,7 +103,7 @@ However, this behavior can be restricted using node selectors, which are explain
         ssh:
           addToKnownHosts: true
         os:
-          distro: ubuntu
+          distro: ubuntu22
       nodes:
         master:
           instances:
@@ -238,7 +238,7 @@ addons:
         ssh:
           addToKnownHosts: true
         os:
-          distro: ubuntu
+          distro: ubuntu22
       nodes:
         master:
           instances:
diff --git a/docs/examples/single-node-cluster.md b/docs/examples/single-node-cluster.md
index a2c39004..102f77f6 100644
--- a/docs/examples/single-node-cluster.md
+++ b/docs/examples/single-node-cluster.md
@@ -66,7 +66,7 @@ This means that the single master node in the cluster will perform both the cont
         ssh:
           addToKnownHosts: true
         os:
-          distro: ubuntu
+          distro: ubuntu22
       nodes:
         master:
           default:
diff --git a/docs/user-guide/configuration/cluster-node-template.md b/docs/user-guide/configuration/cluster-node-template.md
index cfb183f8..82cc664d 100644
--- a/docs/user-guide/configuration/cluster-node-template.md
+++ b/docs/user-guide/configuration/cluster-node-template.md
@@ -37,7 +37,7 @@ cluster:
 
 :material-tag-arrow-up-outline: [v2.1.0][tag 2.1.0]
  
-:octicons-file-symlink-file-24: Default: `ubuntu`
+:octicons-file-symlink-file-24: Default: `ubuntu22`
 
 The operating system for virtual machines can be specified in the node template.
 By default, the Ubuntu distribution is installed on all virtual machines.
@@ -48,23 +48,20 @@ You can select a desired distribution by setting the `os.distro` property.
 cluster:
   nodeTemplate:
     os:
-      distro: debian # (1)!
+      distro: debian12 # (1)!
 ```
 
-1. By default, `ubuntu` is used.
+1. By default, `ubuntu22` is used.
 
 
 The available operating system distribution presets are:
 
-+ **`ubuntu`** - Latest Ubuntu 22.04 release. (default)
-+ `ubuntu22` - Ubuntu 22.04 release as of *2023-10-26*.
-+ `ubuntu20` - Ubuntu 20.04 release as of *2023-10-11*.
-+ **`debian`** - Latest Debian 11 release.
-+ `debian11` - Debian 11 release as of *2023-10-13*.
-+ **`rocky`** - Latest Rocky 9 release.
-+ `rocky9` - Rocky 9.2 release as of *2023-05-13*.
-+ **`centos`** - Latest CentOS Stream 9 release.
-+ `centos9` - CentOS Stream 9 release as of *2023-10-23*.
++ **`ubuntu20`** - Latest Ubuntu 20.04 (Focal) release.
++ **`ubuntu22`** - Latest Ubuntu 22.04 (Jammy) release. (default)
++ **`debian11`** - Latest Debian 11 (Bullseye) release.
++ **`debian12`** - Latest Debian 12 (Bookworm) release.
++ **`centos9`** - Latest CentOS Stream 9 release.
++ **`rocky9`** - Latest Rocky 9 release.
 
 !!! warning "Important"
 
@@ -98,7 +95,7 @@ The source of an image can be either a local path on your system or a URL pointi
 cluster:
   nodeTemplate:
     os:
-      distro: ubuntu
+      distro: ubuntu20
       source: https://cloud-images.ubuntu.com/focal/current/focal-server-cloudimg-amd64.img
 ```
 
diff --git a/docs/user-guide/reference/configuration.md b/docs/user-guide/reference/configuration.md
index faf2cc0c..c2a0dc24 100644
--- a/docs/user-guide/reference/configuration.md
+++ b/docs/user-guide/reference/configuration.md
@@ -642,20 +642,17 @@ Each configuration property is documented with 5 columns: Property name, descrip
     <tr>
       <td><code>cluster.nodeTemplate.os.distro</code></td>
       <td>string</td>
-      <td>ubuntu</td>
+      <td>ubuntu22</td>
       <td></td>
       <td>
         Set OS distribution. Possible values are:
         <ul>
-          <li><code>ubuntu</code></li>
-          <li><code>ubuntu22</code></li>
           <li><code>ubuntu20</code></li>
-          <li><code>debian</code></li>
+          <li><code>ubuntu22</code></li>
           <li><code>debian11</code></li>
-          <li><code>rocky</code></li>
-          <li><code>rocky9</code></li>
-          <li><code>centos</code></li>
+          <li><code>debian12</code></li>
           <li><code>centos9</code></li>
+          <li><code>rocky9</code></li>
         </ul>
       </td>
     </tr>