diff --git a/PhpManager/private/Get-PhpVersionFromApiVersion.ps1 b/PhpManager/private/Get-PhpVersionFromApiVersion.ps1
index cf87401..5d329f2 100644
--- a/PhpManager/private/Get-PhpVersionFromApiVersion.ps1
+++ b/PhpManager/private/Get-PhpVersionFromApiVersion.ps1
@@ -16,18 +16,22 @@ function Get-PhpVersionFromApiVersion {
         return ''
     }
     switch ($ApiVersion) {
+        # https://github.com/php/php-src/blob/php-8.1.0alpha1/Zend/zend_modules.h#L34
+        20201009 {
+            return '8.1'
+        }
         # https://github.com/php/php-src/blob/php-8.0.0rc1/Zend/zend_modules.h#L34
-        # https://github.com/php/php-src/blob/php-8.0.2/Zend/zend_modules.h#L34
+        # https://github.com/php/php-src/blob/php-8.0.7/Zend/zend_modules.h#L34
         20200930 {
             return '8.0'
         }
         # https://github.com/php/php-src/blob/php-7.4.0RC1/Zend/zend_modules.h#L34
-        # https://github.com/php/php-src/blob/php-7.4.11/Zend/zend_modules.h#L34
+        # https://github.com/php/php-src/blob/php-7.4.20/Zend/zend_modules.h#L34
         20190902 {
             return '7.4'
         }
         # https://github.com/php/php-src/blob/php-7.3.0beta1/Zend/zend_modules.h#L34
-        # https://github.com/php/php-src/blob/php-7.3.23/Zend/zend_modules.h#L34
+        # https://github.com/php/php-src/blob/php-7.3.28/Zend/zend_modules.h#L34
         20180731 {
             return '7.3'
         }