diff --git a/src/ncc/Classes/PackageWriter.php b/src/ncc/Classes/PackageWriter.php
index a89cff1..ad8d6ee 100644
--- a/src/ncc/Classes/PackageWriter.php
+++ b/src/ncc/Classes/PackageWriter.php
@@ -108,7 +108,7 @@
             $this->temp_file = @fopen($this->temporary_path, 'wb'); // Create a temporary data file
             $this->package_file = @fopen($file_path, 'wb');
             $this->headers = [
-                PackageStructure::FILE_VERSION => PackageStructureVersions::_2_0,
+                PackageStructure::FILE_VERSION => PackageStructureVersions::_2_0->value,
                 PackageStructure::FLAGS => [],
                 PackageStructure::DIRECTORY => []
             ];
diff --git a/src/ncc/Enums/PackageStructureVersions.php b/src/ncc/Enums/PackageStructureVersions.php
index 649717a..a338409 100644
--- a/src/ncc/Enums/PackageStructureVersions.php
+++ b/src/ncc/Enums/PackageStructureVersions.php
@@ -1,44 +1,36 @@
 <?php
-/*
- * Copyright (c) Nosial 2022-2023, all rights reserved.
- *
- *  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
- *  associated documentation files (the "Software"), to deal in the Software without restriction, including without
- *  limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
- *  Software, and to permit persons to whom the Software is furnished to do so, subject to the following
- *  conditions:
- *
- *  The above copyright notice and this permission notice shall be included in all copies or substantial portions
- *  of the Software.
- *
- *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
- *  INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
- *  PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- *  OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- *  DEALINGS IN THE SOFTWARE.
- *
- */
+    /*
+     * Copyright (c) Nosial 2022-2023, all rights reserved.
+     *
+     *  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+     *  associated documentation files (the "Software"), to deal in the Software without restriction, including without
+     *  limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+     *  Software, and to permit persons to whom the Software is furnished to do so, subject to the following
+     *  conditions:
+     *
+     *  The above copyright notice and this permission notice shall be included in all copies or substantial portions
+     *  of the Software.
+     *
+     *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+     *  INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+     *  PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+     *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+     *  OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+     *  DEALINGS IN THE SOFTWARE.
+     *
+     */
 
-namespace ncc\Enums;
+    namespace ncc\Enums;
 
-    final class PackageStructureVersions
+    enum PackageStructureVersions : string
     {
         /**
          * ncc 1.0.0 to 1.0.3
          */
-        public const _1_0 = '1.0';
+        case _1_0 = '1.0';
 
         /**
          * ncc 1.0.4 and above
          */
-        public const _2_0 = '2.0';
-
-        /**
-         * All supported versions
-         */
-        public const ALL = [
-            self::_1_0,
-            self::_2_0
-        ];
+        case _2_0 = '2.0';
     }
\ No newline at end of file