diff --git a/docs/guides/matrix-create-room.md b/docs/guides/matrix-create-room.md
index 582e94c1..23c9052e 100644
--- a/docs/guides/matrix-create-room.md
+++ b/docs/guides/matrix-create-room.md
@@ -11,7 +11,7 @@ title: "Matrix: Create a New Room"
 ## 1. Create the Room
 
 Rooms are always created by the *CCCHH-Admin* Account whose credentials can be found in *infra-secrets*.
-To create a room, log in to https://element.hamburg.ccc.de and click on *New Conversation* -> *New Room*.
+To create a room, log in to [https://element.hamburg.ccc.de](https://element.hamburg.ccc.de) and click on *New Conversation* -> *New Room*.
 Enter a Room Name and optionally give it an address on the *hamburg.ccc.de* server.
 
 ## 2. Configure Room Metadata
diff --git a/inventories/chaosknoten/host_vars/cloud.yaml b/inventories/chaosknoten/host_vars/cloud.yaml
index 8f299b2d..844cf1bf 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: 34
 # renovate: datasource=docker depName=docker.io/library/postgres
-nextcloud__postgres_version: 15.18
+nextcloud__postgres_version: 16.15
 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.j2 b/resources/chaosknoten/lists/docker_compose/compose.yaml.j2
index 7a109e8c..df6acaa6 100644
--- a/resources/chaosknoten/lists/docker_compose/compose.yaml.j2
+++ b/resources/chaosknoten/lists/docker_compose/compose.yaml.j2
@@ -62,7 +62,7 @@ services:
       - POSTGRES_DB=mailmandb
       - POSTGRES_USER=mailman
       - "POSTGRES_PASSWORD={{ secret__lists__postgres_password }}"
-    image: docker.io/library/postgres:12-alpine
+    image: docker.io/library/postgres:16-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 0d5e34ec..58031c98 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:16-alpine
     environment:
       - "POSTGRES_USER=pretalx"
       - "POSTGRES_PASSWORD={{ secret__pretalx_db_password }}"