diff --git a/src/lib/isPostalCode.js b/src/lib/isPostalCode.js
index 01ae3fc07..ccc627886 100644
--- a/src/lib/isPostalCode.js
+++ b/src/lib/isPostalCode.js
@@ -69,7 +69,7 @@ const patterns = {
   SK: /^\d{3}\s?\d{2}$/,
   TH: fiveDigit,
   TN: fourDigit,
-  TW: /^\d{3}(\d{2})?$/,
+  TW: /^\d{3}(\d{2,3})?$/,
   UA: fiveDigit,
   US: /^\d{5}(-\d{4})?$/,
   ZA: fourDigit,
diff --git a/test/validators.test.js b/test/validators.test.js
index d6e948a41..28deabb11 100644
--- a/test/validators.test.js
+++ b/test/validators.test.js
@@ -12576,6 +12576,7 @@ describe('Validators', () => {
           '399',
           '935',
           '38842',
+          '546023',
         ],
       },
       {