diff --git a/app/code/Magento/Directory/etc/zip_codes.xml b/app/code/Magento/Directory/etc/zip_codes.xml
index f186102911a6a..d915d2945e9e7 100644
--- a/app/code/Magento/Directory/etc/zip_codes.xml
+++ b/app/code/Magento/Directory/etc/zip_codes.xml
@@ -258,7 +258,7 @@
     </zip>
     <zip countryCode="GG">
         <codes>
-            <code id="pattern_1" active="true" example="AB1 2CD">^[a-zA-Z]{2}[0-9]{1}\s[0-9]{1}[a-zA-Z]{2}$</code>
+            <code id="pattern_1" active="true" example="GY10 2AB">^[gG][yY]([1-9]|10)\s?[0-9]{1}[a-zA-Z]{2}$</code>
         </codes>
     </zip>
     <zip countryCode="GH">
@@ -378,7 +378,7 @@
     </zip>
     <zip countryCode="JE">
         <codes>
-            <code id="pattern_1" active="true" example="AB1 2CD">^[a-zA-Z]{2}[0-9]{1}\s[0-9]{1}[a-zA-Z]{2}$</code>
+            <code id="pattern_1" active="true" example="JE2 4PJ">^[jJ][eE][1-5]{1}\s?[0-9]{1}[a-zA-Z]{2}$</code>
         </codes>
     </zip>
     <zip countryCode="JO">
diff --git a/dev/tests/integration/testsuite/Magento/Directory/Model/Country/Postcode/ValidatorTest.php b/dev/tests/integration/testsuite/Magento/Directory/Model/Country/Postcode/ValidatorTest.php
index 0f3a4a20fec09..3806cdba939cd 100644
--- a/dev/tests/integration/testsuite/Magento/Directory/Model/Country/Postcode/ValidatorTest.php
+++ b/dev/tests/integration/testsuite/Magento/Directory/Model/Country/Postcode/ValidatorTest.php
@@ -152,7 +152,7 @@ public function getPostcodesDataProvider()
             ['countryId' => 'GB', 'postcode' => 'Q1 2PL'],
             ['countryId' => 'GE', 'postcode' => '1234'],
             ['countryId' => 'GF', 'postcode' => '12345'],
-            ['countryId' => 'GG', 'postcode' => 'PL5 7TH'],
+            ['countryId' => 'GG', 'postcode' => 'GY10 2AB'],
             ['countryId' => 'GL', 'postcode' => '1234'],
             ['countryId' => 'GH', 'postcode' => 'GA18400'],
             ['countryId' => 'GN', 'postcode' => '123'],
@@ -174,7 +174,7 @@ public function getPostcodesDataProvider()
             ['countryId' => 'IN', 'postcode' => '123456'],
             ['countryId' => 'IS', 'postcode' => '123'],
             ['countryId' => 'IT', 'postcode' => '12345'],
-            ['countryId' => 'JE', 'postcode' => 'TY8 9PL'],
+            ['countryId' => 'JE', 'postcode' => 'JE2 4PJ'],
             ['countryId' => 'JO', 'postcode' => '12345'],
             ['countryId' => 'JP', 'postcode' => '123-4567'],
             ['countryId' => 'JP', 'postcode' => '1234567'],