diff --git a/zenproject/zrc/config.edn b/zenproject/zrc/config.edn
index 13527b3..47548df 100644
--- a/zenproject/zrc/config.edn
+++ b/zenproject/zrc/config.edn
@@ -56,7 +56,7 @@
 
  base-config
  {:zen/tags                #{aidbox.config/config}
-  :validate-binding-url    "https://r4.ontoserver.csiro.au/fhir/ValueSet/$validate-code"
+  :validate-binding-url    "https://tx.test.hl7.org.au/fhir/ValueSet/$validate-code"
   :web                     web-config
   :db                      db-config
   :search                  search-config