diff --git a/.woodpecker/test.yml b/.woodpecker/test.yml
index c3c4d6b..9ca203d 100644
--- a/.woodpecker/test.yml
+++ b/.woodpecker/test.yml
@@ -16,9 +16,9 @@ steps:
     commands:
       - tflint --color
 
-  - name: terraform
-    image: docker.io/jmccann/drone-terraform:8
+  - name: tofu
+    image: quay.io/thegeeklab/wp-opentofu
     settings:
-      actions:
+      action:
         - validate
-      tf_version: 1.5.0
+      tofu_version: 1.6.1
diff --git a/main.tf b/main.tf
index fa48f1f..7c52095 100644
--- a/main.tf
+++ b/main.tf
@@ -151,7 +151,7 @@ resource "restapi_object" "ucs_server" {
       "name" : each.value.name,
       "a" : [
         hcloud_server.server[each.value.name].ipv4_address,
-        hcloud_server.server[each.value.name].ipv6_address,
+        try(each.value.ucs_ipv6_address, hcloud_server.server[each.value.name].ipv6_address),
       ],
     }
   })
diff --git a/versions.tf b/versions.tf
index ff6f93c..525cc5d 100644
--- a/versions.tf
+++ b/versions.tf
@@ -1,13 +1,13 @@
 terraform {
   required_providers {
     cloudflare = {
-      source = "cloudflare/cloudflare"
+      source = "registry.opentofu.org/cloudflare/cloudflare"
     }
     hcloud = {
-      source = "hetznercloud/hcloud"
+      source = "registry.opentofu.org/hetznercloud/hcloud"
     }
     restapi = {
-      source = "Mastercard/restapi"
+      source = "registry.opentofu.org/thegeeklab/restapi"
     }
   }
 }