diff --git a/Dockerfile b/Dockerfile
index 8487b12..354325d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,13 @@
+# renovate: datasource=github-releases depName=jasonlovesdoggo/caddy-defender
+ARG CADDYDEFENDER_VERSION=v0.8.5
+# renovate: datasource=github-releases depName=caddy-dns/rfc2136
+ARG CADDYRFC2136_VERSION=v1.0.0
+
 FROM caddy:2.10.0-builder-alpine@sha256:16205c8e035dae7faae3cb36ff03d76bb08ae2054968a28cf97ef95d28375e46 AS builder
 
 RUN xcaddy build \
-    --with github.com/caddy-dns/rfc2136@e50b9f25dd68882c76758446195aca0507be3c05 \
-    --with github.com/jasonlovesdoggo/caddy-defender@c7ba3d4f6cdfb76886cf3998cff77eaabe456443
+    --with github.com/caddy-dns/rfc2136@${CADDYRFC2136_VERSION} \
+    --with github.com/jasonlovesdoggo/caddy-defender@${CADDYDEFENDER_VERSION}
 
 FROM caddy:2.10.0-alpine@sha256:e2e3a089760c453bc51c4e718342bd7032d6714f15b437db7121bfc2de2654a6
 
diff --git a/renovate.json b/renovate.json
index 4ecf721..ebacc22 100644
--- a/renovate.json
+++ b/renovate.json
@@ -5,6 +5,18 @@
   "labels": [
     "ready for review"
   ],
+  "customManagers": [
+        {
+          "customType": "regex",
+          "fileMatch": [
+            "(^|/|\\.)([Dd]ocker|[Cc]ontainer)file$",
+            "(^|/)([Dd]ocker|[Cc]ontainer)file[^/]*$"
+          ],
+          "matchStrings": [
+            "# renovate: datasource=(?<datasource>[a-zA-Z0-9-._]+?) depName=(?<depName>[^\\s]+?)(?: (lookupName|packageName)=(?<packageName>[^\\s]+?))?(?: versioning=(?<versioning>[^\\s]+?))?(?: extractVersion=(?<extractVersion>[^\\s]+?))?(?: registryUrl=(?<registryUrl>[^\\s]+?))?\\s(?:ENV|ARG)\\s+[A-Za-z0-9_]+?_VERSION[ =][\"']?(?<currentValue>.+?)[\"']?\\s"
+          ]
+        }
+      ],
   "ignoreUnstable": true,
   "minimumReleaseAge": "3",
   "packageRules": [