diff --git a/index.php b/index.php
index 972699d..acc8b3e 100644
--- a/index.php
+++ b/index.php
@@ -22,9 +22,9 @@ function processInput($input) {
 
     // Step 2: Filter only 17 digits long strings
     if (preg_match('/^\d{17}$/', $cleanedInput)) {
-        // Step 3: Check if the first four digits are within 2004-2018
+        // Step 3: Check if the first four digits are within 2007-2025
         $firstFourDigits = substr($cleanedInput, 0, 4);
-        if ($firstFourDigits >= 2004 && $firstFourDigits <= 2018) {
+        if ($firstFourDigits >= 2007 && $firstFourDigits <= 2025) {
             return ['valid' => $cleanedInput];
         } else {
             return ['invalid' => $cleanedInput, 'reason' => 'First four digits are not within 2004-2018'];