diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 000000000..67f8d85d4
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,25 @@
+name: test
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+
+jobs:
+  unit:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions: [ '7.4' ]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          tools: cs2pr, parallel-lint
+
+      - name: Lint sources
+        run: composer exec --no-interaction -- parallel-lint bin/ contrib/ recipe/ src/ tests/ --checkstyle | cs2pr
diff --git a/Dockerfile b/Dockerfile
index bd7b249ba..e4462367f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:7.4-cli-alpine
+FROM php:8.3-cli-alpine
 
 RUN apk add --no-cache bash git openssh-client rsync
 
diff --git a/bin/dep b/bin/dep
index b4c3d689b..43637c8fb 100755
Binary files a/bin/dep and b/bin/dep differ
diff --git a/deployer.phar b/deployer.phar
index b4c3d689b..43637c8fb 100644
Binary files a/deployer.phar and b/deployer.phar differ
diff --git a/recipe/laravel.php b/recipe/laravel.php
index 114efc850..721d3684d 100644
--- a/recipe/laravel.php
+++ b/recipe/laravel.php
@@ -247,10 +247,10 @@ function laravel_version_compare($version, $comparator)
  */
 
 desc('Starts the Reverb server');
-task('artisan:reverb:start', artisan('pulse:start'));
+task('artisan:reverb:start', artisan('reverb:start'));
 
 desc('Restarts the Reverb server');
-task('artisan:reverb:restart', artisan('pulse:restart'));
+task('artisan:reverb:restart', artisan('reverb:restart'));
 
 /*
  * Pulse.
diff --git a/recipe/magento2.php b/recipe/magento2.php
index ca1b19f2d..bc2e97f80 100644
--- a/recipe/magento2.php
+++ b/recipe/magento2.php
@@ -10,6 +10,8 @@
 use Deployer\Exception\RunException;
 use Deployer\Host\Host;
 
+use function Deployer\Support\array_is_list;
+
 const CONFIG_IMPORT_NEEDED_EXIT_CODE = 2;
 const DB_UPDATE_NEEDED_EXIT_CODE = 2;
 const MAINTENANCE_MODE_ACTIVE_OUTPUT_MSG = 'maintenance mode is active';
diff --git a/recipe/symfony.php b/recipe/symfony.php
index f5d9d312d..6435be28d 100644
--- a/recipe/symfony.php
+++ b/recipe/symfony.php
@@ -66,7 +66,7 @@
 desc('Optimize environment variables');
 task('deploy:dump-env', function () {
     within('{{release_or_current_path}}', function () {
-        run('{{bin/composer}} dump-env "${APP_ENV:-prod}"');
+        run('{{bin/composer}} dump-env');
     });
 });
 
diff --git a/src/Component/PharUpdate/Update.php b/src/Component/PharUpdate/Update.php
index 9b850d411..004d12f81 100644
--- a/src/Component/PharUpdate/Update.php
+++ b/src/Component/PharUpdate/Update.php
@@ -101,7 +101,7 @@ public function copyTo(string $file): void
             );
         }
 
-        $mode = 0o755;
+        $mode = 0755;
 
         if (file_exists($file)) {
             $mode = fileperms($file) & 511;
diff --git a/src/Documentation/DocGen.php b/src/Documentation/DocGen.php
index 0e8ee636a..29cebac77 100644
--- a/src/Documentation/DocGen.php
+++ b/src/Documentation/DocGen.php
@@ -1,4 +1,4 @@
-<?php
+<?php // lint >= 8.0
 
 declare(strict_types=1);
 
diff --git a/src/Support/helpers.php b/src/Support/helpers.php
index cdda3ff10..b6251f7bd 100644
--- a/src/Support/helpers.php
+++ b/src/Support/helpers.php
@@ -65,6 +65,18 @@ function array_merge_alternate(array $original, array $override)
     return $original;
 }
 
+/**
+ * Polyfill for the array_is_list function introduced in PHP 8.1.
+ *
+ * @param array $array The array to check.
+ * @return bool Returns true if the array is a list, false otherwise.
+ */
+function array_is_list(array $array): bool
+{
+    $keys = array_keys($array);
+    return $keys === array_keys($keys);
+}
+
 /**
  * Determines if the given string contains the given value.
  */
diff --git a/tests/legacy/recipe/named_arguments.php b/tests/legacy/recipe/named_arguments.php
index 204412185..f0280e916 100644
--- a/tests/legacy/recipe/named_arguments.php
+++ b/tests/legacy/recipe/named_arguments.php
@@ -1,4 +1,4 @@
-<?php
+<?php // lint >= 8.0
 
 namespace Deployer;