diff --git a/terraform/dns.tf b/terraform/dns.tf
index 1d76cc1..9e96dc4 100644
--- a/terraform/dns.tf
+++ b/terraform/dns.tf
@@ -35,12 +35,6 @@ locals {
     "support.wellcomelibrary.org"          = "54.75.184.123"
     "support02.wellcomelibrary.org"        = "34.251.227.203"
     "wt-lon-sierrasso.wellcomelibrary.org" = "195.143.129.211"
-
-    # This is the IP address for the "Sierra Production App Server", as
-    # hosted on III infrastructure.
-    #
-    # It was sent in an email from LSS to Alex Chan, dated 30 August 2022.
-    "libsys.wellcomelibrary.org" = "18.130.128.205"
   }
 
   mx_records = {