diff --git a/host-test.yml b/host-test.yml
index d28f002..2906249 100644
--- a/host-test.yml
+++ b/host-test.yml
@@ -11,3 +11,4 @@ renovate_image: renovate/renovate:36.25.0
 
 image: ffmd/bind9-md-freifunk-net:v2022122301
 image: "{{ renovate_image }}"
+dokuwiki_image: bitnami/dokuwiki:20220731@sha256:989ab52cf2d2e0f84166e114ca4ce88f59546b8f6d34958905f8d81c18cbd759
diff --git a/renovate.json b/renovate.json
index f0f9f22..dd75994 100644
--- a/renovate.json
+++ b/renovate.json
@@ -9,7 +9,7 @@
       "datasourceTemplate": "docker",
       "versioningTemplate": "docker",
       "matchStrings": [
-        "image: (?<depName>.*?):(?<currentValue>.*?)(@sha256:(?<currentDigest>.*?))?\\s"
+        "image: (?<depName>.*?):(?<currentValue>.*?)(@(?<currentDigest>sha256:.*?))?\\s"
       ]
     }
   ]