diff --git a/.idea/php.xml b/.idea/php.xml
index b20d972..eee0274 100644
--- a/.idea/php.xml
+++ b/.idea/php.xml
@@ -14,7 +14,7 @@
       <path value="/usr/share/php" />
     </include_path>
   </component>
-  <component name="PhpProjectSharedConfiguration" php_language_level="7.1">
+  <component name="PhpProjectSharedConfiguration" php_language_level="8.3">
     <option name="suggestChangeDefaultLanguageLevel" value="false" />
   </component>
   <component name="PhpStanOptionsConfiguration">
diff --git a/src/OptsLib/Parse.php b/src/OptsLib/Parse.php
index a8f7b54..a923a23 100644
--- a/src/OptsLib/Parse.php
+++ b/src/OptsLib/Parse.php
@@ -26,23 +26,23 @@
          *
          * @var string
          */
-        private static $regex = "/(?(?=-)-(?(?=-)-(?'bigflag'[^\\s=]+)|(?'smallflag'\\S))(?:\\s*=\\s*|\\s+)(?(?!-)(?(?=[\\\"\\'])((?<![\\\\])['\"])(?'string'(?:.(?!(?<![\\\\])\\3))*.?)\\3|(?'value'\\S+)))(?:\\s+)?|(?'unmatched'\\S+))/";
+        private static string $regex = "/(?(?=-)-(?(?=-)-(?'bigflag'[^\\s=]+)|(?'smallflag'\\S))(?:\\s*=\\s*|\\s+)(?(?!-)(?(?=[\\\"\\'])((?<![\\\\])['\"])(?'string'(?:.(?!(?<![\\\\])\\3))*.?)\\3|(?'value'\\S+)))(?:\\s+)?|(?'unmatched'\\S+))/";
 
         /**
          * Cache of the parsed arguments. This is used to prevent the arguments from being parsed more than once.
          *
          * @var array
          */
-        private static $args_cache;
+        private static array $args_cache;
 
         /**
          * Parses the input arguments into an array of flags and values
          *
-         * @param string|array $input array The input arguments
+         * @param array|string $input array The input arguments
          * @param int $max_arguments The maximum number of arguments to parse
          * @return array The parsed arguments
          */
-        public static function parseArgument($input, int $max_arguments=1000): array
+        public static function parseArgument(array|string $input, int $max_arguments=1000): array
         {
             if (is_string($input))
             {