diff --git a/inventories/chaosknoten/host_vars/cloud.yaml b/inventories/chaosknoten/host_vars/cloud.yaml
index b6cf771..1164730 100644
--- a/inventories/chaosknoten/host_vars/cloud.yaml
+++ b/inventories/chaosknoten/host_vars/cloud.yaml
@@ -1,7 +1,7 @@
 # renovate: datasource=docker depName=git.hamburg.ccc.de/ccchh/oci-images/nextcloud
 nextcloud__version: 32
 # renovate: datasource=docker depName=docker.io/library/postgres
-nextcloud__postgres_version: 15.15
+nextcloud__postgres_version: 18.1
 nextcloud__fqdn: cloud.hamburg.ccc.de
 nextcloud__data_dir: /data/nextcloud
 nextcloud__extra_configuration: "{{ lookup('ansible.builtin.template', 'resources/chaosknoten/cloud/nextcloud/extra_configuration.config.php.j2') }}"
diff --git a/resources/chaosknoten/acmedns/docker_compose/index.html.j2 b/resources/chaosknoten/acmedns/docker_compose/index.html.j2
index 02216da..1170cec 100644
--- a/resources/chaosknoten/acmedns/docker_compose/index.html.j2
+++ b/resources/chaosknoten/acmedns/docker_compose/index.html.j2
@@ -4,14 +4,21 @@
 <style>
 table, tr, th, td {
     border-collapse: collapse;
-    border: 1px solid black;
+}
+caption {
+    caption-side: bottom;
+    padding: 2px 4px;
 }
 th, td {
+    border: 1px solid black;
     padding: 2px 4px;
 }
 th {
     text-align: left;
 }
+td {
+    font-family: "Courier", monospace;
+}
 </style>
 </head>
 <body>
@@ -24,19 +31,23 @@ th {
 
 <table id="results" style="display: none">
 <tr>
-    <th>Full Domain</th><td id="fulldomain">foo</td>
+    <th>Full Domain</th><td id="fulldomain">undefined</td>
 </tr>
 <tr>
-    <th>Sub Domain</th><td id="subdomain">foo</td>
+    <th>Subdomain</th><td id="subdomain">undefined</td>
 </tr>
 <tr>
-    <th>Username</th><td id="username">foo</td>
+    <th>X-Api-User</th><td id="username">undefined</td>
 </tr>
 <tr>
-    <th>Password</th><td id="password">foo</td>
+    <th>X-Api-Key</th><td id="password">undefined</td>
 </tr>
+<caption><b>Important!</b> This information will only be shown once. Please
+copy or otherwise save it immediately.</caption>
 </table>
 
+<p><b>Note: there is no way to delete registrations.</b> Each registration is small, so it's not an immediate problem, but please do not click register unless you are planning to really create a new entry.</p>
+
 <script>
 document.getElementById("register").addEventListener("click", (event) => {
     const register = async () => {
diff --git a/resources/chaosknoten/keycloak/docker_compose/compose.yaml.j2 b/resources/chaosknoten/keycloak/docker_compose/compose.yaml.j2
index a260ab1..562df5c 100644
--- a/resources/chaosknoten/keycloak/docker_compose/compose.yaml.j2
+++ b/resources/chaosknoten/keycloak/docker_compose/compose.yaml.j2
@@ -46,7 +46,7 @@ services:
       - "8080:8080"
 
   db:
-    image: docker.io/library/postgres:15.15
+    image: docker.io/library/postgres:18.1
     restart: unless-stopped
     networks:
       - keycloak
diff --git a/resources/chaosknoten/lists/docker_compose/compose.yaml b/resources/chaosknoten/lists/docker_compose/compose.yaml
index cdfd70a..7050a8b 100644
--- a/resources/chaosknoten/lists/docker_compose/compose.yaml
+++ b/resources/chaosknoten/lists/docker_compose/compose.yaml
@@ -56,7 +56,7 @@ services:
       - POSTGRES_DB=mailmandb
       - POSTGRES_USER=mailman
       - POSTGRES_PASSWORD=wvQjbMRnwFuxGEPz
-    image: docker.io/library/postgres:12-alpine
+    image: docker.io/library/postgres:18-alpine
     volumes:
       - /opt/mailman/database:/var/lib/postgresql/data
     networks:
diff --git a/resources/chaosknoten/pad/docker_compose/compose.yaml.j2 b/resources/chaosknoten/pad/docker_compose/compose.yaml.j2
index 790cf95..e13191a 100644
--- a/resources/chaosknoten/pad/docker_compose/compose.yaml.j2
+++ b/resources/chaosknoten/pad/docker_compose/compose.yaml.j2
@@ -3,7 +3,7 @@
 
 services:
   database:
-    image: docker.io/library/postgres:15-alpine
+    image: docker.io/library/postgres:18-alpine
     environment:
       - "POSTGRES_USER=hedgedoc"
       - "POSTGRES_PASSWORD={{ secret__hedgedoc_db_password }}"
diff --git a/resources/chaosknoten/pretalx/docker_compose/compose.yaml.j2 b/resources/chaosknoten/pretalx/docker_compose/compose.yaml.j2
index 091d113..2f6f990 100644
--- a/resources/chaosknoten/pretalx/docker_compose/compose.yaml.j2
+++ b/resources/chaosknoten/pretalx/docker_compose/compose.yaml.j2
@@ -3,7 +3,7 @@
 
 services:
   database:
-    image: docker.io/library/postgres:15-alpine
+    image: docker.io/library/postgres:18-alpine
     environment:
       - "POSTGRES_USER=pretalx"
       - "POSTGRES_PASSWORD={{ secret__pretalx_db_password }}"
diff --git a/resources/chaosknoten/tickets/docker_compose/compose.yaml.j2 b/resources/chaosknoten/tickets/docker_compose/compose.yaml.j2
index 938883b..3d35c0b 100644
--- a/resources/chaosknoten/tickets/docker_compose/compose.yaml.j2
+++ b/resources/chaosknoten/tickets/docker_compose/compose.yaml.j2
@@ -1,7 +1,7 @@
 ---
 services:
   database:
-    image: docker.io/library/postgres:15-alpine
+    image: docker.io/library/postgres:18-alpine
     environment:
       - "POSTGRES_USER=pretix"
       - "POSTGRES_PASSWORD={{ secret__pretix_db_password }}"

Full Domain	foo	Full Domain	undefined
Sub Domain	foo	Subdomain	undefined
Username	foo	X-Api-User	undefined
Password	foo	X-Api-Key	undefined