diff --git a/.github/scripts/setup-symfony-env.bash b/.github/scripts/setup-symfony-env.bash
new file mode 100755
index 0000000..0f84efe
--- /dev/null
+++ b/.github/scripts/setup-symfony-env.bash
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+set -ex
+
+if [ -z "$1" ]; then
+    echo "Please specify the Symfony version to install"
+    exit 1
+fi
+
+echo "Installing Symfony version $1"
+
+# This is not required for CI, but it allows to test the script locally
+function cleanup {
+    echo "Cleaning up"
+    mv composer.origin.json composer.json
+}
+
+function install-specified-symfony-version {
+    local symfony_version=$1
+    cp composer.json composer.origin.json
+    rm composer.lock || true
+    rm -Rf vendor || true
+    sed -i 's/\^5.4 || \^6.0 || \^7.0/\^'$symfony_version'/g' composer.json
+    composer install
+}
+
+trap cleanup EXIT
+
+install-specified-symfony-version $1
diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
index dcff7f6..ca1cfde 100644
--- a/.github/workflows/static-analysis.yml
+++ b/.github/workflows/static-analysis.yml
@@ -16,7 +16,7 @@ jobs:
       - uses: php-actions/composer@v6
         with:
           progress: yes
-          php_version: 8.0
+          php_version: 8.1
           version: 2
       - name: "PHP-CS-Fixer"
         run: composer check-cs
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f75f202..c89878a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -14,19 +14,25 @@ jobs:
     strategy:
       max-parallel: 10
       matrix:
-        php: [ '8.0', '8.1', '8.2']
-        sf_version: [ '5.4.*', '6.0.*', '6.3.*' ]
+        php: [ '8.1', '8.2', '8.3']
+        sf_version: [ '5.4', '6.4', '7.1' ]
         exclude:
-          - php: 8.0
-            sf_version: 6.3.*
+          - php: 8.1
+            sf_version: 7.1
 
     steps:
       - uses: actions/checkout@v2
-      - uses: php-actions/composer@v6
+      - name: Validate composer-5.4.json
+        run: composer validate --strict
+
+      - name: Setup PHP ${{ matrix.php }}
+        uses: shivammathur/setup-php@v2
         with:
-          progress: yes
-          php_version: ${{matrix.php}}
-          version: 2
+          php-version: ${{ matrix.php }}
+
+      - name: Override Symfony version
+        run: composer run ci-symfony-install-version ${{ matrix.sf_version }}
+
       - uses: php-actions/phpunit@v3
         with:
           configuration: phpunit.xml.dist
diff --git a/.gitignore b/.gitignore
index 726a685..a18abad 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,6 @@
 composer.lock
 .phpunit.result.cache
 .idea
-.php-cs-fixer.cache
\ No newline at end of file
+.php-cs-fixer.cache
+
+composer.origin.json
diff --git a/composer.json b/composer.json
index d825c55..63870d2 100644
--- a/composer.json
+++ b/composer.json
@@ -11,22 +11,22 @@
         }
     ],
     "require": {
-        "php": ">=8.0",
-        "laudis/neo4j-php-client": "^3.0.5",
+        "php": ">=8.1",
+        "laudis/neo4j-php-client": "^3.1",
         "twig/twig": "^3.0",
         "ext-json": "*",
-        "symfony/dependency-injection": "^5.4 || ^6.0",
-        "symfony/config": "^5.4 || ^6.0"
+        "symfony/dependency-injection": "^5.4 || ^6.0 || ^7.0",
+        "symfony/config": "^5.4 || ^6.0 || ^7.0"
     },
     "require-dev": {
-        "matthiasnoback/symfony-dependency-injection-test": "^4.3",
+        "matthiasnoback/symfony-dependency-injection-test": "^4.3 || ^5.0",
         "phpunit/phpunit": "^9.5",
         "psalm/plugin-symfony": "^5.0",
-        "symfony/console": "^5.4 || ^6.0",
-        "symfony/framework-bundle": "^5.4 || ^6.0",
-        "symfony/http-kernel": "^5.4 || ^6.0",
+        "symfony/console": "^5.4 || ^6.0 || ^7.0",
+        "symfony/framework-bundle": "^5.4 || ^6.0 || ^7.0",
+        "symfony/http-kernel": "^5.4 || ^6.0 || ^7.0",
         "symfony/test-pack": "^1.1",
-        "symfony/yaml": "^5.4 || ^6.0",
+        "symfony/yaml": "^5.4 || ^6.0 || ^7.0",
         "vimeo/psalm": "^5.15.0",
         "kubawerlos/php-cs-fixer-custom-fixers": "^3.0",
         "friendsofphp/php-cs-fixer": "^3.30",
@@ -51,6 +51,7 @@
     "scripts": {
         "psalm": "php bin/console.php cache:warmup && vendor/bin/psalm --show-info=true",
         "fix-cs": "vendor/bin/php-cs-fixer fix",
-        "check-cs": "vendor/bin/php-cs-fixer fix --dry-run"
+        "check-cs": "vendor/bin/php-cs-fixer fix --dry-run",
+        "ci-symfony-install-version": "./.github/scripts/setup-symfony-env.bash"
     }
 }
diff --git a/src/ClientFactory.php b/src/ClientFactory.php
index 05a2e37..972f7e1 100644
--- a/src/ClientFactory.php
+++ b/src/ClientFactory.php
@@ -40,14 +40,14 @@ class ClientFactory
      */
     public function __construct(
         private EventHandler $eventHandler,
-        private array|null $driverConfig,
-        private array|null $sessionConfiguration,
-        private array|null $transactionConfiguration,
+        private ?array $driverConfig,
+        private ?array $sessionConfiguration,
+        private ?array $transactionConfiguration,
         private array $connections,
-        private string|null $defaultDriver,
-        private ClientInterface|null $client,
-        private StreamFactoryInterface|null $streamFactory,
-        private RequestFactoryInterface|null $requestFactory,
+        private ?string $defaultDriver,
+        private ?ClientInterface $client,
+        private ?StreamFactoryInterface $streamFactory,
+        private ?RequestFactoryInterface $requestFactory,
     ) {
     }
 
@@ -134,7 +134,7 @@ private function makeTransactionConfig(): TransactionConfiguration
     /**
      * @param DriverAuthenticationArray|null $auth
      */
-    private function createAuth(array|null $auth, string $dsn): AuthenticateInterface
+    private function createAuth(?array $auth, string $dsn): AuthenticateInterface
     {
         if (null === $auth) {
             return Authenticate::fromUrl(Uri::create($dsn));
@@ -155,7 +155,7 @@ private function createAuth(array|null $auth, string $dsn): AuthenticateInterfac
     /**
      * @param SslConfigArray|null $ssl
      */
-    private function makeSslConfig(array|null $ssl): SslConfiguration
+    private function makeSslConfig(?array $ssl): SslConfiguration
     {
         if (null === $ssl) {
             return new SslConfiguration(
diff --git a/src/Collector/Neo4jDataCollector.php b/src/Collector/Neo4jDataCollector.php
index 9014743..2e3f739 100644
--- a/src/Collector/Neo4jDataCollector.php
+++ b/src/Collector/Neo4jDataCollector.php
@@ -27,7 +27,7 @@ public function __construct(
     ) {
     }
 
-    public function collect(Request $request, Response $response, \Throwable $exception = null): void
+    public function collect(Request $request, Response $response, ?\Throwable $exception = null): void
     {
         $this->data['successful_statements'] = array_map(
             static fn (ResultSummary $summary) => $summary->toArray(),
diff --git a/src/Event/FailureEvent.php b/src/Event/FailureEvent.php
index f5e1c61..2981193 100644
--- a/src/Event/FailureEvent.php
+++ b/src/Event/FailureEvent.php
@@ -14,7 +14,7 @@ class FailureEvent extends Event
 
     protected bool $shouldThrowException = true;
 
-    public function __construct(private string|null $alias, private Statement $statement, private Neo4jException $exception)
+    public function __construct(private ?string $alias, private Statement $statement, private Neo4jException $exception)
     {
     }
 
@@ -33,7 +33,7 @@ public function shouldThrowException(): bool
         return $this->shouldThrowException;
     }
 
-    public function getAlias(): string|null
+    public function getAlias(): ?string
     {
         return $this->alias;
     }
diff --git a/src/Event/PostRunEvent.php b/src/Event/PostRunEvent.php
index 75e9a96..b0bf84b 100644
--- a/src/Event/PostRunEvent.php
+++ b/src/Event/PostRunEvent.php
@@ -12,7 +12,7 @@ class PostRunEvent extends Event
     public const EVENT_ID = 'neo4j.post_run';
 
     public function __construct(
-        private string|null $alias,
+        private ?string $alias,
         private ResultSummary $result
     ) {
     }
@@ -22,7 +22,7 @@ public function getResult(): ResultSummary
         return $this->result;
     }
 
-    public function getAlias(): string|null
+    public function getAlias(): ?string
     {
         return $this->alias;
     }
diff --git a/src/Event/PreRunEvent.php b/src/Event/PreRunEvent.php
index cd59239..6ab3f4d 100644
--- a/src/Event/PreRunEvent.php
+++ b/src/Event/PreRunEvent.php
@@ -11,7 +11,7 @@ class PreRunEvent extends Event
 {
     public const EVENT_ID = 'neo4j.pre_run';
 
-    public function __construct(private string|null $alias, private Statement $statement)
+    public function __construct(private ?string $alias, private Statement $statement)
     {
     }
 
@@ -20,7 +20,7 @@ public function getStatement(): Statement
         return $this->statement;
     }
 
-    public function getAlias(): string|null
+    public function getAlias(): ?string
     {
         return $this->alias;
     }
diff --git a/src/EventHandler.php b/src/EventHandler.php
index 34579c5..ce2a83c 100644
--- a/src/EventHandler.php
+++ b/src/EventHandler.php
@@ -36,7 +36,7 @@ public function __construct(?EventDispatcherInterface $dispatcher)
      *
      * @return SummarizedResult<T>
      */
-    public function handle(callable $runHandler, Statement $statement, string|null $alias): SummarizedResult
+    public function handle(callable $runHandler, Statement $statement, ?string $alias): SummarizedResult
     {
         if (null === $this->dispatcher) {
             return $runHandler($statement);
diff --git a/src/SymfonyClient.php b/src/SymfonyClient.php
index efceb9d..615f748 100644
--- a/src/SymfonyClient.php
+++ b/src/SymfonyClient.php
@@ -30,17 +30,17 @@ public function __construct(
     ) {
     }
 
-    public function run(string $statement, iterable $parameters = [], string $alias = null): ?SummarizedResult
+    public function run(string $statement, iterable $parameters = [], ?string $alias = null): ?SummarizedResult
     {
         return $this->runStatement(new Statement($statement, $parameters), $alias);
     }
 
-    public function runStatement(Statement $statement, string $alias = null): ?SummarizedResult
+    public function runStatement(Statement $statement, ?string $alias = null): ?SummarizedResult
     {
         return $this->handler->handle(fn (Statement $statement) => $this->client->runStatement($statement, $alias), $statement, $alias);
     }
 
-    public function runStatements(iterable $statements, string $alias = null): CypherList
+    public function runStatements(iterable $statements, ?string $alias = null): CypherList
     {
         $tbr = [];
         foreach ($statements as $statement) {
@@ -50,7 +50,7 @@ public function runStatements(iterable $statements, string $alias = null): Cyphe
         return CypherList::fromIterable($tbr);
     }
 
-    public function beginTransaction(iterable $statements = null, string $alias = null, TransactionConfiguration $config = null): UnmanagedTransactionInterface
+    public function beginTransaction(?iterable $statements = null, ?string $alias = null, ?TransactionConfiguration $config = null): UnmanagedTransactionInterface
     {
         $tsx = new SymfonyTransaction($this->client->beginTransaction(null, $alias, $config), $this->handler, $alias);
 
@@ -68,7 +68,7 @@ public function getDriver(?string $alias): DriverInterface
         return $this->client->getDriver($alias);
     }
 
-    public function writeTransaction(callable $tsxHandler, string $alias = null, TransactionConfiguration $config = null)
+    public function writeTransaction(callable $tsxHandler, ?string $alias = null, ?TransactionConfiguration $config = null)
     {
         $sessionConfig = SessionConfiguration::default()->withAccessMode(AccessMode::READ());
         $session = $this->client->getDriver($alias)->createSession($sessionConfig);
@@ -79,7 +79,7 @@ public function writeTransaction(callable $tsxHandler, string $alias = null, Tra
         );
     }
 
-    public function readTransaction(callable $tsxHandler, string $alias = null, TransactionConfiguration $config = null)
+    public function readTransaction(callable $tsxHandler, ?string $alias = null, ?TransactionConfiguration $config = null)
     {
         $sessionConfig = SessionConfiguration::default()->withAccessMode(AccessMode::WRITE());
         $session = $this->client->getDriver($alias)->createSession($sessionConfig);
@@ -90,27 +90,27 @@ public function readTransaction(callable $tsxHandler, string $alias = null, Tran
         );
     }
 
-    public function transaction(callable $tsxHandler, string $alias = null, TransactionConfiguration $config = null)
+    public function transaction(callable $tsxHandler, ?string $alias = null, ?TransactionConfiguration $config = null)
     {
         return $this->writeTransaction($tsxHandler, $alias, $config);
     }
 
-    public function verifyConnectivity(string $driver = null): bool
+    public function verifyConnectivity(?string $driver = null): bool
     {
         return $this->client->verifyConnectivity($driver);
     }
 
-    public function bindTransaction(string $alias = null, TransactionConfiguration $config = null): void
+    public function bindTransaction(?string $alias = null, ?TransactionConfiguration $config = null): void
     {
         $this->client->bindTransaction($alias, $config);
     }
 
-    public function commitBoundTransaction(string $alias = null, int $depth = 1): void
+    public function commitBoundTransaction(?string $alias = null, int $depth = 1): void
     {
         $this->client->commitBoundTransaction($alias, $depth);
     }
 
-    public function rollbackBoundTransaction(string $alias = null, int $depth = 1): void
+    public function rollbackBoundTransaction(?string $alias = null, int $depth = 1): void
     {
         $this->client->rollbackBoundTransaction($alias, $depth);
     }
diff --git a/src/SymfonyTransaction.php b/src/SymfonyTransaction.php
index fee502b..bc8a46a 100644
--- a/src/SymfonyTransaction.php
+++ b/src/SymfonyTransaction.php
@@ -18,7 +18,7 @@ class SymfonyTransaction implements UnmanagedTransactionInterface
     /**
      * @param UnmanagedTransactionInterface<SummarizedResult<CypherMap>> $tsx
      */
-    public function __construct(private UnmanagedTransactionInterface $tsx, private EventHandler $handler, private string|null $alias)
+    public function __construct(private UnmanagedTransactionInterface $tsx, private EventHandler $handler, private ?string $alias)
     {
     }