diff --git a/inventories/chaosknoten/host_vars/sunders.sops.yaml b/inventories/chaosknoten/host_vars/sunders.sops.yaml
index 904a8fb..75b2d10 100644
--- a/inventories/chaosknoten/host_vars/sunders.sops.yaml
+++ b/inventories/chaosknoten/host_vars/sunders.sops.yaml
@@ -2,6 +2,7 @@ ansible_pull__age_private_key: ENC[AES256_GCM,data:tP84jDYh2zeWjf7wqDoefm9zaeg/Q
 secret__sunders_db_root_password: ENC[AES256_GCM,data:m3Xt6dOKibRflon/rWG9KmdBPHEBbqE/GIpKdFI1Di7Lpl/THxzrgx12mTK6aZnwDrM=,iv:hD/UGwo88ye9CxyTCEQ0SVon2+ipPjeA9NF2/OhYwmc=,tag:DRdQ5hvTgUO5FVae/ul7kQ==,type:str]
 secret__sunders_db_camera_password: ENC[AES256_GCM,data:tOt4ImpedgfGvRpcThPO30YyEl/bP244ruJQzAYodJIsEhFuk5LxHpPASEnsqlN6m3M=,iv:rQXBjiYWZlzeUdaqDdTlrdbSSqGaPDeZOPhUaMjgcjU=,tag:lkSlIdJWFowyPfWEjpC/Zg==,type:str]
 secret__sunders_db_camera_select_password: ENC[AES256_GCM,data:PveGcD2WmvpMc8bafGY1c45aQ2XH/ym2yj5YacauQPeZO6Xem3kaxU0kwjs0Wd26ugc=,iv:tk288L9i0lxsJbTFq5ET5IiKkJfMQwc6uKNFXILcD7o=,tag:hOIivp3mOtDNBCsKvrSrBw==,type:str]
+secret__acme_dns_api_key_sunders_hamburg_ccc_de: ENC[AES256_GCM,data:OXGasHc1qf4r8wj0N2qqjZzWO3zg5L5ZGRjAwmlEXi9/gaTpUWT1xw==,iv:pKaNajQ9JxxUwuv/scJZhP6UdSob3GrODShk2t75580=,tag:3atM6IddvYhoAmNlqooooQ==,type:str]
 sops:
   age:
     - recipient: age1na0nh9ndnr9cxpnlvstrxskr4fxf4spnkw48ufl7m43f98y40y7shhnvgd
@@ -13,8 +14,8 @@ sops:
         KzBPS0Y3OXBUSjFWRVQwaGQ0M2M4ajgKYGgcfiDsBsJQmSodfPejhAcAekatqkJ9
         Xa6Y7mWUiAKcbYY9to7/7/u5FUW3JYdv1GX7vAC2ZtZv6WXGLtjdwg==
         -----END AGE ENCRYPTED FILE-----
-  lastmodified: "2025-11-01T16:32:10Z"
-  mac: ENC[AES256_GCM,data:8Q6DBSFtzwHuVxduRlZYxlRWO0trSoesNGUR8r/dWnp9ashFBSZqVyffXb4Vq6DB5thANJ6/b3PCNsHdiAKn6Ai2UT8G0HimFjUUgNpZxo4xoNGmDhDvfdBgUL6O2pHhY+ojjguUXDYeYc99+eaxfKqZ3w+PAPaySltKm99foz8=,iv:ILOErdiWbUjk9kovXXZYcAqZFQp2Wo1Tm14sgK3niWg=,tag:Q2gT6wbQyhDXjoQEG2Lngw==,type:str]
+  lastmodified: "2026-03-31T14:49:48Z"
+  mac: ENC[AES256_GCM,data:Ln//LDvcSqRknJGQvdzwoRvZOK/ZBqfTJqnxm9fhQsfZudUchZ5u7PXQf/0y3GnrYVx9agGGoKQN3VFehrZfpUE4ygjvmLHiqJSZVREaD4Yq0PuaY54/wN4YX8H1nE7ILdm1QvFRzpMUpSnTM1Yrr6cMIFMHcRRpL73LfG1nwPY=,iv:NXT/cPTnbg7ESiI7Aj3OOpCLMM4j355NAMVJNsIppzY=,tag:iLFTfiFdDxpwvC88fLf3Mw==,type:str]
   pgp:
     - created_at: "2026-03-05T19:17:55Z"
       enc: |-
@@ -216,4 +217,4 @@ sops:
         -----END PGP MESSAGE-----
       fp: 41FFAF3D519CF5C039FBD8414BCC213729AF0E49
   unencrypted_suffix: _unencrypted
-  version: 3.11.0
+  version: 3.12.1
diff --git a/inventories/chaosknoten/host_vars/sunders.yaml b/inventories/chaosknoten/host_vars/sunders.yaml
index 4563a46..1fd5c40 100644
--- a/inventories/chaosknoten/host_vars/sunders.yaml
+++ b/inventories/chaosknoten/host_vars/sunders.yaml
@@ -1,8 +1,13 @@
 docker_compose__compose_file_content: "{{ lookup('ansible.builtin.template', 'resources/chaosknoten/sunders/docker_compose/compose.yaml.j2') }}"
 
 certbot__acme_account_email_address: le-admin@hamburg.ccc.de
-certbot__certificate_domains:
-  - "sunders.hamburg.ccc.de"
+certbot__certs:
+  - commonName: "sunders.hamburg.ccc.de"
+    challengeType: "dns-01-acme-dns"
+    dns_01_acme_dns:
+      subdomain: a5ee8a99-3cdf-4212-972e-c0b6fda1242f
+      apiUser: 45e4ea1c-8322-4d92-9f52-adf52b521131
+      apiKey: "{{ secret__acme_dns_api_key_sunders_hamburg_ccc_de }}"
 certbot__new_cert_commands:
   - "systemctl reload nginx.service"
 
diff --git a/resources/chaosknoten/public-reverse-proxy/nginx/acme_challenge.conf b/resources/chaosknoten/public-reverse-proxy/nginx/acme_challenge.conf
index d79f299..7bb4993 100644
--- a/resources/chaosknoten/public-reverse-proxy/nginx/acme_challenge.conf
+++ b/resources/chaosknoten/public-reverse-proxy/nginx/acme_challenge.conf
@@ -29,7 +29,6 @@ map $host $upstream_acme_challenge_host {
     wiki.hamburg.ccc.de wiki.hosts.hamburg.ccc.de:31820;
     www.hamburg.ccc.de 172.31.17.151:31820;
     tickets.hamburg.ccc.de tickets.hosts.hamburg.ccc.de:31820;
-    sunders.hamburg.ccc.de sunders.hosts.hamburg.ccc.de:31820;
     zammad.hamburg.ccc.de zammad.hosts.hamburg.ccc.de:31820;
     eh03.easterhegg.eu 172.31.17.151:31820;
     eh05.easterhegg.eu 172.31.17.151:31820;