diff --git a/group_vars/all/vars.yml b/group_vars/all/vars.yml
index bf50427..cb92679 100644
--- a/group_vars/all/vars.yml
+++ b/group_vars/all/vars.yml
@@ -118,10 +118,11 @@ global_chromium_configuration_directory: "/etc/chromium"
 global_chromium_managed_policies_file: "{{ global_chromium_configuration_directory }}/policies/managed/managed_policies.json"
 
 global_dns_upstream_servers:
-  - "9.9.9.11"
-  - "149.112.112.11"
-  - "2620:fe::11"
-  - "2620:fe::fe:11"
+  # Quad9 DNS with DNSSEC support, without EDNS
+  - "9.9.9.9"
+  - "149.112.112.112"
+  - "2620:fe::fe"
+  - "2620:fe::9"
 
 global_dnsmasq_configuration_file: "/etc/dnsmasq.conf"
 global_dnsmasq_configuration_directory: "/etc/dnsmasq.d"