diff --git a/CHANGELOG.md b/CHANGELOG.md
index fae6502e95..dcd3635573 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,11 @@ This is a log of major user-visible changes in each phpMyFAQ release.
 - removed Webpack, now using Vite v6 (Thorsten)
 - migrated from Jest to vitest (Thorsten)
 
+### phpMyFAQ v4.0.1 - unreleased
+
+- improved update handling of .htaccess file (Thorsten)
+- updated 3rd party dependencies (Thorsten)
+
 ### phpMyFAQ v4.0.0 - 2024-12-06
 
 - changed PHP requirement to PHP 8.2 or later (Thorsten)
diff --git a/phpmyfaq/admin/category.main.php b/phpmyfaq/admin/category.main.php
index 5ce8bdbefd..5640a7f348 100644
--- a/phpmyfaq/admin/category.main.php
+++ b/phpmyfaq/admin/category.main.php
@@ -46,7 +46,7 @@
 // Image upload
 //
 $request = Request::createFromGlobals();
-$uploadedFile = $request->files->get('image');
+$uploadedFile = $request->files->get('image') ?? [];
 $categoryImage = new Image($faqConfig);
 $categoryImage->setUploadedFile($uploadedFile);
 
@@ -77,9 +77,9 @@
             ->setName(Filter::filterInput(INPUT_POST, 'name', FILTER_SANITIZE_SPECIAL_CHARS))
             ->setDescription(Filter::filterInput(INPUT_POST, 'description', FILTER_SANITIZE_SPECIAL_CHARS))
             ->setUserId(Filter::filterInput(INPUT_POST, 'user_id', FILTER_VALIDATE_INT))
-            ->setGroupId(Filter::filterInput(INPUT_POST, 'group_id', FILTER_VALIDATE_INT))
+            ->setGroupId(Filter::filterInput(INPUT_POST, 'group_id', FILTER_VALIDATE_INT) ?? -1)
             ->setActive(Filter::filterInput(INPUT_POST, 'active', FILTER_VALIDATE_INT) ?? false)
-            ->setImage($categoryImage->getFileName($categoryId, $categoryLang))
+            ->setImage($categoryImage->getFileName($categoryId, $categoryLang) ?? '')
             ->setParentId($parentId)
             ->setShowHome(Filter::filterInput(INPUT_POST, 'show_home', FILTER_VALIDATE_INT));
 
diff --git a/phpmyfaq/src/phpMyFAQ/Setup/EnvironmentConfigurator.php b/phpmyfaq/src/phpMyFAQ/Setup/EnvironmentConfigurator.php
index 7c12c01aa4..cbe03f21f6 100644
--- a/phpmyfaq/src/phpMyFAQ/Setup/EnvironmentConfigurator.php
+++ b/phpmyfaq/src/phpMyFAQ/Setup/EnvironmentConfigurator.php
@@ -1,5 +1,20 @@
 <?php
 
+/**
+ * The environment configurator is responsible for adjusting the .htaccess file to the user's environment.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public License,
+ * v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ * obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * @package   phpMyFAQ
+ * @author    Thorsten Rinne <thorsten@phpmyfaq.de>
+ * @copyright 2024 phpMyFAQ Team
+ * @license   https://www.mozilla.org/MPL/2.0/ Mozilla Public License Version 2.0
+ * @link      https://www.phpmyfaq.de
+ * @since     2024-11-16
+ */
+
 namespace phpMyFAQ\Setup;
 
 use phpMyFAQ\Configuration;
diff --git a/phpmyfaq/src/phpMyFAQ/System.php b/phpmyfaq/src/phpMyFAQ/System.php
index 21a376b690..614167d4b4 100644
--- a/phpmyfaq/src/phpMyFAQ/System.php
+++ b/phpmyfaq/src/phpMyFAQ/System.php
@@ -47,7 +47,7 @@ class System
     /**
      * Patch level.
      */
-    private const VERSION_PATCH_LEVEL = 0;
+    private const VERSION_PATCH_LEVEL = 1;
 
     /**
      * Pre-release version.