diff --git a/Formula/z/zns.rb b/Formula/z/zns.rb
index 907183e6a3f2..db68ad355481 100644
--- a/Formula/z/zns.rb
+++ b/Formula/z/zns.rb
@@ -29,6 +29,6 @@ def install
 
   test do
     assert_match version.to_s, shell_output("#{bin}/zns --version")
-    assert_match "a.iana-servers.net.", shell_output("#{bin}/zns example.com -q NS --server 1.1.1.1")
+    assert_match "hera.ns.cloudflare.com.", shell_output("#{bin}/zns example.com -q NS --server 1.1.1.1")
   end
 end