diff --git a/packages/auth/parse-cookie-domain.ts b/packages/auth/parse-cookie-domain.ts
index fee151ea..6376cec7 100644
--- a/packages/auth/parse-cookie-domain.ts
+++ b/packages/auth/parse-cookie-domain.ts
@@ -1,66 +1,15 @@
 // List of known multi-part TLDs that should be treated as single domains
 const MULTI_PART_TLDS = [
-  'co.uk',
-  'com.au',
-  'co.za',
-  'co.nz',
-  'co.jp',
-  'co.kr',
-  'co.in',
-  'co.il',
-  'com.br',
-  'com.mx',
-  'com.ar',
-  'com.pe',
-  'com.cl',
-  'com.co',
-  'com.ve',
-  'net.au',
-  'org.au',
-  'gov.au',
-  'edu.au',
-  'net.nz',
-  'org.nz',
-  'gov.nz',
-  'org.uk',
-  'gov.uk',
-  'ac.uk',
-  'nhs.uk',
-  'org.za',
-  'gov.za',
-  'ac.za',
-  'ac.jp',
-  'or.jp',
-  'go.jp',
-  'or.kr',
-  'go.kr',
-  'org.in',
-  'gov.in',
-  'ac.in',
-  'org.il',
-  'gov.il',
-  'ac.il',
-  'net.br',
-  'org.br',
-  'gov.br',
-  'net.mx',
-  'org.mx',
-  'gov.mx',
-  'net.ar',
-  'org.ar',
-  'gov.ar',
-  'net.pe',
-  'org.pe',
-  'gov.pe',
-  'net.cl',
-  'org.cl',
-  'gov.cl',
-  'net.co',
-  'org.co',
-  'gov.co',
-  'net.ve',
-  'org.ve',
-  'gov.ve',
+  /com\.\w{2}$/,
+  /co\.\w{2}$/,
+  /ac\.\w{2}$/,
+  /net\.\w{2}$/,
+  /org\.\w{2}$/,
+  /gov\.\w{2}$/,
+  /edu\.\w{2}$/,
+  /nhs\.\w{2}$/,
+  /or\.\w{2}$/,
+  /go\.\w{2}$/,
 ];
 
 export const parseCookieDomain = (url: string) => {
@@ -87,7 +36,7 @@ export const parseCookieDomain = (url: string) => {
   // Handle multi-part TLDs like co.uk, com.au, etc.
   if (parts.length >= 3) {
     const potentialTLD = parts.slice(-2).join('.');
-    if (MULTI_PART_TLDS.includes(potentialTLD)) {
+    if (MULTI_PART_TLDS.some((tld) => tld.test(potentialTLD))) {
       // For domains like example.co.uk or subdomain.example.co.uk
       // Use the last 3 parts: .example.co.uk
       return {