diff --git a/inventories/chaosknoten/host_vars/cloud.yaml b/inventories/chaosknoten/host_vars/cloud.yaml
index 35fb162..f62fd7e 100644
--- a/inventories/chaosknoten/host_vars/cloud.yaml
+++ b/inventories/chaosknoten/host_vars/cloud.yaml
@@ -1,4 +1,5 @@
 nextcloud__version: 32
+# renovate: datasource=docker depName=postgres
 nextcloud__postgres_version: 15.14
 nextcloud__fqdn: cloud.hamburg.ccc.de
 nextcloud__data_dir: /data/nextcloud
diff --git a/renovate.json b/renovate.json
index f72babb..1eafa73 100644
--- a/renovate.json
+++ b/renovate.json
@@ -30,6 +30,18 @@
       "versioning": "regex:^(?<major>\\d+\\.\\d+)(?:\\.(?<minor>\\d+))$"
     }
   ],
+  "customManagers": [
+    // Custom manager using regex for letting Renovate find dependencies in inventory variables.
+    {
+      "customType": "regex",
+      "managerFilePatterns": [
+        "//inventories/.*?_vars/.*?\\.ya?ml$/"
+      ],
+      "matchStrings": [
+        "# renovate: datasource=(?<datasource>[a-zA-Z0-9-._]+?) depName=(?<depName>[^\\s]+?)(?: packageName=(?<packageName>[^\\s]+?))?(?: versioning=(?<versioning>[^\\s]+?))?\\s*.+?\\s*:\\s*[\"']?(?<currentValue>.+?)[\"']?\\s"
+      ]
+    }
+  ],
   "docker-compose": {
     "managerFilePatterns": [
       "/(^|/)(?:docker-)?compose[^/]*\\.ya?ml.j2$/"