diff --git a/frameworks/PHP/symfony/config/packages/doctrine.yaml b/frameworks/PHP/symfony/config/packages/doctrine.yaml
index 1f1096a9b17..f4e37e0f98f 100644
--- a/frameworks/PHP/symfony/config/packages/doctrine.yaml
+++ b/frameworks/PHP/symfony/config/packages/doctrine.yaml
@@ -2,12 +2,13 @@ doctrine:
     dbal:
         # configure these for your database server
         driver: 'pdo_mysql'
-        server_version: '5.7'
+        server_version: '8.0'
         charset: utf8mb4
         default_table_options:
             charset: utf8mb4
             collate: utf8mb4_unicode_ci
-
+        options:
+            !php/const \PDO::ATTR_PERSISTENT: true
         url: '%env(resolve:DATABASE_URL)%'
     orm:
         auto_generate_proxy_classes: true
diff --git a/frameworks/PHP/symfony/src/Controller/DbController.php b/frameworks/PHP/symfony/src/Controller/DbController.php
index a0210ccd113..32fe28a9f1f 100644
--- a/frameworks/PHP/symfony/src/Controller/DbController.php
+++ b/frameworks/PHP/symfony/src/Controller/DbController.php
@@ -36,7 +36,7 @@ public function db(): JsonResponse
      */
     public function queries(Request $request): JsonResponse
     {
-        $queries = $request->query->getInt('queries', 1);
+        $queries = (int) $request->query->get('queries', 1);
         $queries = min(max($queries, 1), 500);
 
         // possibility for enhancement is the use of SplFixedArray -> http://php.net/manual/de/class.splfixedarray.php
@@ -54,7 +54,7 @@ public function queries(Request $request): JsonResponse
      */
     public function update(Request $request): JsonResponse
     {
-        $queries = $request->query->getInt('queries', 1);
+        $queries = (int) $request->query->get('queries', 1);
         $queries = min(500, max(1, $queries));
 
         $worlds = [];
diff --git a/frameworks/PHP/symfony/src/Controller/DbRawController.php b/frameworks/PHP/symfony/src/Controller/DbRawController.php
index 7f16e271510..ffc3f8dbf36 100644
--- a/frameworks/PHP/symfony/src/Controller/DbRawController.php
+++ b/frameworks/PHP/symfony/src/Controller/DbRawController.php
@@ -35,7 +35,7 @@ public function db(): JsonResponse
      */
     public function queries(Request $request): JsonResponse
     {
-        $queries = $request->query->getInt('queries', 1);
+        $queries = (int) $request->query->get('queries', 1);
         $queries = min(max($queries, 1), 500);
 
         // possibility for enhancement is the use of SplFixedArray -> http://php.net/manual/de/class.splfixedarray.php
@@ -55,7 +55,7 @@ public function queries(Request $request): JsonResponse
      */
     public function updates(Request $request): JsonResponse
     {
-        $queries = $request->query->getInt('queries', 1);
+        $queries = (int) $request->query->get('queries', 1);
         $queries = min(500, max(1, $queries));
 
         $worlds = [];
diff --git a/frameworks/PHP/symfony/src/Controller/FortunesController.php b/frameworks/PHP/symfony/src/Controller/FortunesController.php
index 22c26f65114..5838bd0262d 100644
--- a/frameworks/PHP/symfony/src/Controller/FortunesController.php
+++ b/frameworks/PHP/symfony/src/Controller/FortunesController.php
@@ -26,7 +26,7 @@ public function __construct(Environment $twig, FortuneRepository $fortuneReposit
      */
     public function fortunes(): Response
     {
-        $fortunes = $this->fortuneRepository->findAll();
+        $fortunes = $this->fortuneRepository->findBy([]);
 
         $runtimeFortune = new Fortune();
         $runtimeFortune->setId(0);
diff --git a/frameworks/PHP/symfony/symfony-raw.dockerfile b/frameworks/PHP/symfony/symfony-raw.dockerfile
index f42d6953581..cc5d5ae45ff 100644
--- a/frameworks/PHP/symfony/symfony-raw.dockerfile
+++ b/frameworks/PHP/symfony/symfony-raw.dockerfile
@@ -18,6 +18,11 @@ WORKDIR /symfony
 RUN mkdir -m 777 -p /symfony/var/cache/{dev,prod} /symfony/var/log
 RUN COMPOSER_ALLOW_SUPERUSER=1 composer install --classmap-authoritative --no-dev
 RUN COMPOSER_ALLOW_SUPERUSER=1 composer dump-env prod
+
+# removes hardcoded option `ATTR_STATEMENT_CLASS` conflicting with `ATTR_PERSISTENT`. Hack not needed when upgrading to Doctrine 3
+# see https://github.com/doctrine/dbal/issues/2315
+RUN sed -i '/PDO::ATTR_STATEMENT_CLASS/d' ./vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php
+
 RUN php bin/console cache:clear
 
 CMD service php7.3-fpm start && \
diff --git a/frameworks/PHP/symfony/symfony.dockerfile b/frameworks/PHP/symfony/symfony.dockerfile
index f42d6953581..cc5d5ae45ff 100644
--- a/frameworks/PHP/symfony/symfony.dockerfile
+++ b/frameworks/PHP/symfony/symfony.dockerfile
@@ -18,6 +18,11 @@ WORKDIR /symfony
 RUN mkdir -m 777 -p /symfony/var/cache/{dev,prod} /symfony/var/log
 RUN COMPOSER_ALLOW_SUPERUSER=1 composer install --classmap-authoritative --no-dev
 RUN COMPOSER_ALLOW_SUPERUSER=1 composer dump-env prod
+
+# removes hardcoded option `ATTR_STATEMENT_CLASS` conflicting with `ATTR_PERSISTENT`. Hack not needed when upgrading to Doctrine 3
+# see https://github.com/doctrine/dbal/issues/2315
+RUN sed -i '/PDO::ATTR_STATEMENT_CLASS/d' ./vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php
+
 RUN php bin/console cache:clear
 
 CMD service php7.3-fpm start && \