diff --git a/inventories/chaosknoten/host_vars/cloud.yaml b/inventories/chaosknoten/host_vars/cloud.yaml
index 9c28d58..0a1d845 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: 15.17
+nextcloud__postgres_version: 18.3
 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/lists/docker_compose/compose.yaml b/resources/chaosknoten/lists/docker_compose/compose.yaml
index fb65594..65248bb 100644
--- a/resources/chaosknoten/lists/docker_compose/compose.yaml
+++ b/resources/chaosknoten/lists/docker_compose/compose.yaml
@@ -58,7 +58,7 @@ 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/pretalx/docker_compose/compose.yaml.j2 b/resources/chaosknoten/pretalx/docker_compose/compose.yaml.j2
index 0bbfcb8..091bd44 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/public-reverse-proxy/nginx/acme_challenge.conf b/resources/chaosknoten/public-reverse-proxy/nginx/acme_challenge.conf
index 3bcd0fb..5b9fa94 100644
--- a/resources/chaosknoten/public-reverse-proxy/nginx/acme_challenge.conf
+++ b/resources/chaosknoten/public-reverse-proxy/nginx/acme_challenge.conf
@@ -4,6 +4,8 @@ map $host $upstream_acme_challenge_host {
     c3cat.de 172.31.17.151:31820;
     www.c3cat.de 172.31.17.151:31820;
     staging.c3cat.de 172.31.17.151:31820;
+    c3dog.de 172.31.17.151:31820;
+    www.c3dog.de 172.31.17.151:31820;
     ccchoir.de ccchoir.hosts.hamburg.ccc.de:31820;
     www.ccchoir.de ccchoir.hosts.hamburg.ccc.de:31820;
     cloud.hamburg.ccc.de cloud.hosts.hamburg.ccc.de:31820;
diff --git a/resources/chaosknoten/public-reverse-proxy/nginx/nginx.conf b/resources/chaosknoten/public-reverse-proxy/nginx/nginx.conf
index 01edbfe..47b0c29 100644
--- a/resources/chaosknoten/public-reverse-proxy/nginx/nginx.conf
+++ b/resources/chaosknoten/public-reverse-proxy/nginx/nginx.conf
@@ -49,6 +49,8 @@ stream {
         c3cat.de 172.31.17.151:8443;
         www.c3cat.de 172.31.17.151:8443;
         staging.c3cat.de 172.31.17.151:8443;
+        c3dog.de 172.31.17.151:8443;
+        www.c3dog.de 172.31.17.151:8443;
         git.hamburg.ccc.de 172.31.17.154:8443;
         eh03.easterhegg.eu 172.31.17.151:8443;
         eh05.easterhegg.eu 172.31.17.151:8443;