diff --git a/README.md b/README.md
index c692e411..f9e9553a 100644
--- a/README.md
+++ b/README.md
@@ -338,7 +338,7 @@ GET /cronjob/calendar/reminder?cronpw={your-auth-token}
 
 ## System requirements
 
-- PHP ^8.2
+- PHP ^8.3
 - MySQL (10.4.27-MariaDB or similar)
 - SMTP server for e-mailing
 - Docker with Docker-Compose for containerization
diff --git a/dockerfile b/dockerfile
index 4cee71fb..63f35139 100644
--- a/dockerfile
+++ b/dockerfile
@@ -14,7 +14,7 @@ RUN composer install --no-scripts --no-autoloader
 RUN composer dump-autoload --optimize
 
 # Second stage: Apache + PHP setup
-FROM php:8.2.0-apache
+FROM php:8.3.0-apache
 
 # Set the working directory
 WORKDIR /var/www/html
diff --git a/public/install/index.php b/public/install/index.php
index 6f03269d..7fa233c3 100644
--- a/public/install/index.php
+++ b/public/install/index.php
@@ -84,8 +84,8 @@
 
                             <tbody>
                                 <tr>
-                                    <td>PHP 8.2</td>
-                                    <td class="is-right"><?= ((phpversion() >= '8.2') ? '<span class="is-successful"><i class="fas fa-check-circle"></i></span>': '<span class="is-insufficient">8.2 required, yours: ' . phpversion() . '</span>') ?></td>
+                                    <td>PHP 8.3</td>
+                                    <td class="is-right"><?= ((phpversion() >= '8.3') ? '<span class="is-successful"><i class="fas fa-check-circle"></i></span>': '<span class="is-insufficient">8.3 required, yours: ' . phpversion() . '</span>') ?></td>
                                 </tr>
 
                                 <tr>