diff --git a/hosts/containers/mediawiki/default.nix b/hosts/containers/mediawiki/default.nix
index 40071847..6d22045d 100644
--- a/hosts/containers/mediawiki/default.nix
+++ b/hosts/containers/mediawiki/default.nix
@@ -17,6 +17,8 @@ in
     mounts = [ "etc" "home" "var" ];
   };
 
+  security.acme.defaults.server = "https://acme-staging-v02.api.letsencrypt.org/directory";
+
   services.nginx = {
     enable = true;
     virtualHosts."wiki.c3d2.de" = {