diff --git a/operating-systems/buer.scm b/operating-systems/buer.scm
index 99d0754..94481c1 100644
--- a/operating-systems/buer.scm
+++ b/operating-systems/buer.scm
@@ -211,12 +211,12 @@
                             (list channel:guix
                                   channel:radix)))
                     (substitute-urls
-                     (cons "https://berlin.guix.gnu.org"
-                           %default-substitute-urls))
-                    (authorized-keys
-                     (cons* substitute-key:yuria.pub
-                            substitute-key:yumiko.pub
-                            %default-authorized-guix-keys))
+                      (list "https://ci.guix.gnu.org"
+                            "https://berlin.guix.gnu.org"
+                            "https://mirrors.sjtug.sjtu.edu.cn/guix"
+                            "http://hydra-guix-129.guix.gnu.org"
+                            "https://bordeaux-singapore-mirror.cbaines.net"
+                            "https://bordeaux-us-east-mirror.cbaines.net"))
                     (extra-options `("--max-jobs=8" "--cores=4"))))
           (service guix-publish-service-type
                    (guix-publish-configuration