diff --git a/public/index.php b/public/index.php
index f99b313..8309b26 100644
--- a/public/index.php
+++ b/public/index.php
@@ -1032,9 +1032,6 @@ if($reqPath === '/auth/register') {
             }
 
             if(!isset($authError)) {
-                if(!preg_match('#^([a-zA-Z0-9-_]{1,20})$#', $registerUsername)) {
-                }
-
                 try {
                     $createdUser = User::create(
                         $registerUsername,
diff --git a/src/HtmlText.php b/src/HtmlText.php
index fc8b79a..bb50962 100644
--- a/src/HtmlText.php
+++ b/src/HtmlText.php
@@ -9,6 +9,6 @@ class HtmlText implements HtmlTypeInterface {
     }
 
     public function asHTML(): string {
-        return htmlspecialchars($this->text);
+        return htmlspecialchars($this->text, ENT_COMPAT | ENT_SUBSTITUTE | ENT_HTML5);
     }
 }
diff --git a/src/Upload.php b/src/Upload.php
index f029c54..c627d78 100644
--- a/src/Upload.php
+++ b/src/Upload.php
@@ -6,6 +6,7 @@ use Exception;
 class UploadNotFoundException extends Exception {};
 class UploadCreationFailedException extends Exception {};
 
+#[\AllowDynamicProperties]
 final class Upload {
     private const ID_CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';
 
diff --git a/src/User.php b/src/User.php
index 5f2f9c7..c23ec13 100644
--- a/src/User.php
+++ b/src/User.php
@@ -9,6 +9,7 @@ class UserCreationInvalidNameException extends Exception {}
 class UserCreationInvalidPasswordException extends Exception {}
 class UserCreationInvalidMailException extends Exception {}
 
+#[\AllowDynamicProperties]
 class User {
     public function __construct() {
     }
diff --git a/src/UserInvite.php b/src/UserInvite.php
index 437f447..7d1dc71 100644
--- a/src/UserInvite.php
+++ b/src/UserInvite.php
@@ -6,6 +6,7 @@ use Exception;
 class UserInviteNotFoundException extends Exception {}
 class UserInviteCreationFailedException extends Exception {}
 
+#[\AllowDynamicProperties]
 final class UserInvite {
     private const TOKEN_LENGTH = 16;
 
diff --git a/src/UserSession.php b/src/UserSession.php
index 0fb20e4..1081d9b 100644
--- a/src/UserSession.php
+++ b/src/UserSession.php
@@ -6,6 +6,7 @@ use Exception;
 final class UserSessionNotFoundException extends Exception {};
 final class UserSessionCreatedFailedException extends Exception {};
 
+#[\AllowDynamicProperties]
 class UserSession {
     private const TOKEN_CHARS = 'abcdefghijklmnopqrstuvwxyz-0123456789_ABCDEFGHIJKLMNOPQRSTUVWXYZ';
     private static $instance = null;
diff --git a/src/Zone.php b/src/Zone.php
index c5d1d5d..45f7475 100644
--- a/src/Zone.php
+++ b/src/Zone.php
@@ -9,6 +9,7 @@ class ZoneInvalidIdException extends Exception {};
 class ZoneInvalidNameException extends Exception {};
 class ZoneInvalidTitleException extends Exception {};
 
+#[\AllowDynamicProperties]
 final class Zone {
     private $effects = null;
     private $passiveMode = false;
diff --git a/src/ZoneEffect.php b/src/ZoneEffect.php
index 7f8828e..93b8433 100644
--- a/src/ZoneEffect.php
+++ b/src/ZoneEffect.php
@@ -5,6 +5,7 @@ use Exception;
 
 class ZoneEffectClassNotFoundException extends Exception {};
 
+#[\AllowDynamicProperties]
 final class ZoneEffect {
     private const CLASS_NAME = '\\YTKNS\\Effects\\%sEffect';
 
diff --git a/src/ZoneRedirect.php b/src/ZoneRedirect.php
index 9b106ed..17225a8 100644
--- a/src/ZoneRedirect.php
+++ b/src/ZoneRedirect.php
@@ -1,6 +1,7 @@
 <?php
 namespace YTKNS;
 
+#[\AllowDynamicProperties]
 final class ZoneRedirect {
     public function __construct() {
     }
diff --git a/src/ZoneTask.php b/src/ZoneTask.php
index af7878e..cbdb3a3 100644
--- a/src/ZoneTask.php
+++ b/src/ZoneTask.php
@@ -1,6 +1,7 @@
 <?php
 namespace YTKNS;
 
+#[\AllowDynamicProperties]
 final class ZoneTask {
     public function getZoneId(): int {
         return $this->zone_id ?? 0;
diff --git a/src/ZoneView.php b/src/ZoneView.php
index b7e68ea..48d747b 100644
--- a/src/ZoneView.php
+++ b/src/ZoneView.php
@@ -1,6 +1,7 @@
 <?php
 namespace YTKNS;
 
+#[\AllowDynamicProperties]
 final class ZoneView {
     private const THRESHOLD = 60 * 60 * 24;