diff --git a/composer.json b/composer.json
index 8286f9d..fdefc19 100644
--- a/composer.json
+++ b/composer.json
@@ -1,9 +1,9 @@
 {
     "name": "jadu/doctrine-types",
     "type": "library",
-    "require": {
-        "php": ">=7.4",
-        "doctrine/dbal": "^2.9"
+     "require": {
+        "php": ">=8.1",
+        "doctrine/dbal": "~3.7"
     },
     "description": "Jadu Doctrine Types",
     "autoload": {
diff --git a/src/UnicodeTextType.php b/src/UnicodeTextType.php
index dd8e6c3..3a951dc 100644
--- a/src/UnicodeTextType.php
+++ b/src/UnicodeTextType.php
@@ -7,7 +7,15 @@
 
 class UnicodeTextType extends Type
 {
-    public function getSQLDeclaration(array $fieldDeclaration, AbstractPlatform $platform)
+    /**
+     * Returns the SQL declaration for the given field.
+     *
+     * @param array           $fieldDeclaration
+     * @param AbstractPlatform $platform
+     *
+     * @return string
+     */
+    public function getSQLDeclaration(array $fieldDeclaration, AbstractPlatform $platform): string
     {
         if ($platform->getName() === 'mysql') {
             return 'TEXT COMMENT \'(DC2Type:unicodetext)\'';
@@ -17,23 +25,55 @@ public function getSQLDeclaration(array $fieldDeclaration, AbstractPlatform $pla
         }
     }
 
+    /**
+     * Converts a value from the database representation to the PHP representation.
+     *
+     * @param mixed            $value
+     * @param AbstractPlatform $platform
+     *
+     * @return mixed
+     */
+
     public function convertToPHPValue($value, AbstractPlatform $platform)
     {
         return $value;
     }
 
+    /**
+     * Converts a value from the PHP representation to the database representation.
+     *
+     * @param mixed            $value
+     * @param AbstractPlatform $platform
+     *
+     * @return mixed
+     */
+
     public function convertToDatabaseValue($value, AbstractPlatform $platform)
     {
         return $value;
     }
 
+    /**
+     * Gets the name of this type.
+     *
+     * @return string
+     */
+
     public function getName()
     {
         return 'unicodetext';
     }
 
+    /**
+     * Checks if this type requires a SQL comment hint.
+     *
+     * @param AbstractPlatform $platform
+     *
+     * @return bool
+     */
+
     public function requiresSQLCommentHint(AbstractPlatform $platform)
     {
         return $platform->getName() != 'mysql';
     }
-}
\ No newline at end of file
+}