diff --git a/src/RequiredFields.php b/src/RequiredFields.php
index 1875f9a..e836742 100644
--- a/src/RequiredFields.php
+++ b/src/RequiredFields.php
@@ -99,7 +99,7 @@ public static function getRequiredFieldsForOlderVersions(
         }
     }
 
-    private static function getRequiredFieldsForSqlite(
+    protected static function getRequiredFieldsForSqlite(
         $withNullables = false,
         $withDefaults = false,
         $withPrimaryKey = false
@@ -121,7 +121,7 @@ private static function getRequiredFieldsForSqlite(
             ->toArray();
     }
 
-    private static function getRequiredFieldsForMysqlAndMariaDb(
+    protected static function getRequiredFieldsForMysqlAndMariaDb(
         $withNullables = false,
         $withDefaults = false,
         $withPrimaryKey = false
@@ -166,7 +166,7 @@ private static function getRequiredFieldsForMysqlAndMariaDb(
             ->toArray();
     }
 
-    private static function getRequiredFieldsForPostgres(
+    protected static function getRequiredFieldsForPostgres(
         $withNullables = false,
         $withDefaults = false,
         $withPrimaryKey = false
@@ -242,7 +242,7 @@ private static function getRequiredFieldsForPostgres(
             ->toArray();
     }
 
-    private static function getRequiredFieldsForSqlServer(
+    protected static function getRequiredFieldsForSqlServer(
         $withNullables = false,
         $withDefaults = false,
         $withPrimaryKey = false
@@ -302,7 +302,7 @@ private static function getRequiredFieldsForSqlServer(
     /**
      * @return string
      */
-    private static function getTableFromThisModel()
+    protected static function getTableFromThisModel()
     {
         $table = (new self)->getTable();