diff --git a/composer.json b/composer.json
index d322cec..c835919 100644
--- a/composer.json
+++ b/composer.json
@@ -6,18 +6,18 @@
     "require": {
         "php":                          ">=7.3",
         "hostnet/asset-lib":            "^2.0.0",
-        "symfony/config":               "^4.3 || ^5.0",
-        "symfony/console":              "^4.3 || ^5.0",
-        "symfony/dependency-injection": "^4.3 || ^5.0",
-        "symfony/http-kernel":          "^4.3 || ^5.0",
-        "symfony/process":              "^4.3 || ^5.0"
+        "symfony/config":               "^5.4",
+        "symfony/console":              "^5.4",
+        "symfony/dependency-injection": "^5.4",
+        "symfony/http-kernel":          "^5.4",
+        "symfony/process":              "^5.4"
     },
     "require-dev": {
         "hostnet/phpcs-tool":       "^9.0.0",
         "phpspec/prophecy-phpunit": "^2.0.1",
         "phpunit/phpunit":          "^9.5.5",
-        "symfony/framework-bundle": "^4.3 || ^5.0",
-        "symfony/yaml":             "^4.3 || ^5.0",
+        "symfony/framework-bundle": "^5.4",
+        "symfony/yaml":             "^5.4",
         "twig/twig":                "^3.0.0"
     },
     "autoload": {
diff --git a/src/Command/CompileCommand.php b/src/Command/CompileCommand.php
index 8bf2d05..ca3288d 100644
--- a/src/Command/CompileCommand.php
+++ b/src/Command/CompileCommand.php
@@ -37,7 +37,7 @@ public function __construct(ConfigInterface $config, BundlerInterface $bundler,
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         switch ($output->getVerbosity()) {
             case OutputInterface::VERBOSITY_DEBUG:
diff --git a/src/Command/DebugCommand.php b/src/Command/DebugCommand.php
index 2b640da..c0a73c8 100644
--- a/src/Command/DebugCommand.php
+++ b/src/Command/DebugCommand.php
@@ -38,7 +38,7 @@ protected function configure(): void
     /**
      * {@inheritdoc}
      */
-    protected function execute(InputInterface $input, OutputInterface $output)
+    protected function execute(InputInterface $input, OutputInterface $output): int
     {
         if ($input->getArgument('file')) {
             $this->checkFile($output, $input->getArgument('file'));
diff --git a/src/EventListener/AssetsChangeListener.php b/src/EventListener/AssetsChangeListener.php
index 86c0598..aa28c12 100644
--- a/src/EventListener/AssetsChangeListener.php
+++ b/src/EventListener/AssetsChangeListener.php
@@ -25,7 +25,7 @@ public function __construct(BundlerInterface $bundler, BuildConfig $build_config
     public function onKernelRequest(RequestEvent $e): void
     {
         // Only trigger on the master request.
-        if ($e->getRequestType() !== HttpKernelInterface::MASTER_REQUEST) {
+        if ($e->getRequestType() !== HttpKernelInterface::MAIN_REQUEST) {
             return;
         }
 
diff --git a/test/EventListener/AssetsChangeListenerTest.php b/test/EventListener/AssetsChangeListenerTest.php
index bb822f7..d9efd27 100644
--- a/test/EventListener/AssetsChangeListenerTest.php
+++ b/test/EventListener/AssetsChangeListenerTest.php
@@ -47,7 +47,7 @@ public function testOnKernelRequest(): void
         $kernel  = $this->prophesize(HttpKernelInterface::class);
         $request = new Request();
 
-        $e = new RequestEvent($kernel->reveal(), $request, HttpKernelInterface::MASTER_REQUEST);
+        $e = new RequestEvent($kernel->reveal(), $request, HttpKernelInterface::MAIN_REQUEST);
 
         $this->assets_change_listener->onKernelRequest($e);
     }