diff --git a/host-tau.yml b/host-tau.yml
index cbaae34..a9ace8c 100644
--- a/host-tau.yml
+++ b/host-tau.yml
@@ -12,7 +12,9 @@
 
     dokuwiki_domain: "wiki.netz39.de"
     dokuwiki_port: 9005
-    dokuwiki_image: "bitnami/dokuwiki:20220731"
+    # This container is pinned, because there are issues
+    # with backwards compatibility within the same tag!
+    dokuwiki_image: "bitnami/dokuwiki:20220731@sha256:989ab52cf2d2e0f84166e114ca4ce88f59546b8f6d34958905f8d81c18cbd759"
 
   roles:
     - role: docker_setup