Set v10 in composer.json and ext_emconf.php

composer.json

@@ -23,6 +23,6 @@
     }
   },
   "require": {
-    "typo3/cms-core": "^9.5"
+    "typo3/cms-core": "^9.5 || ^10.4"
   }
 }

ext_emconf.php

 <?php
 
-$EM_CONF[$_EXTKEY] = array(
+$EM_CONF[$_EXTKEY] = [
     'title' => 'Election',
     'description' => 'voting / polling tool',
     'category' => 'fe',
-    'constraints' => array(
-        'depends' => array(
-            'typo3' => '9.5.5-9.5.99',
-        ),
-        'conflicts' => array(),
-        'suggests' => array(),
-    ),
+    'constraints' => [
+        'depends' => [
+            'typo3' => '9.5.5-10.4.99',
+        ]
+    ],
     'state' => 'beta',
     'uploadfolder' => false,
     'createDirs' => '',
@@ -18,5 +16,5 @@ $EM_CONF[$_EXTKEY] = array(
     'author' => 'Oliver Eglseder, Stefan Busemann, Christoph Pascher',
     'author_email' => 'php@vxvr.de, stefan.busemann@in2code.de, c.pascher@browserwerk.de',
     'author_company' => 'TYPO3 Association',
-    'version' => '0.3.3',
-);
+    'version' => '0.5.1-dev',
+];