diff --git a/http/headers/www-authenticate.json b/http/headers/www-authenticate.json
index 7ec5857249b988..82fe980cc4f573 100644
--- a/http/headers/www-authenticate.json
+++ b/http/headers/www-authenticate.json
@@ -294,7 +294,7 @@
         "Negotiate": {
           "__compat": {
             "description": "<code>Negotiate</code> (Kerberos) authentication",
-            "spec_url": "https://datatracker.ietf.org/doc/html/rfc4120#top",
+            "spec_url": "https://www.ietf.org/rfc/rfc4559.txt",
             "support": {
               "chrome": {
                 "version_added": null
@@ -343,7 +343,7 @@
         "NTLM": {
           "__compat": {
             "description": "<code>NTLM</code> authentication",
-            "spec_url": "https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-ntht/#published-version",
+            "spec_url": "https://www.ietf.org/rfc/rfc4559.txt",
             "support": {
               "chrome": {
                 "version_added": null