diff --git a/.github/workflows/run-grumphp-test.yml b/.github/workflows/run-grumphp-test.yml
index ac91e76..1daf90b 100644
--- a/.github/workflows/run-grumphp-test.yml
+++ b/.github/workflows/run-grumphp-test.yml
@@ -6,12 +6,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php:
-          - '8.1'
-          - '8.2'
+        php: ['8.1', '8.2', '8.3-rc']
     container:
       image: kanti/buildy:${{ matrix.php }}
     steps:
-      - uses: actions/checkout@v2
-      - run: COMPOSER_ROOT_VERSION=dev-main composer install --no-progress --no-scripts -n
+      - uses: actions/checkout@v4
+      - run: git config --global --add safe.directory /__w/grumphp-bom-task/grumphp-bom-task
+      - run: COMPOSER_ROOT_VERSION=dev-main composer install --no-progress --no-scripts -n --ignore-platform-req=php+
       - run: ./vendor/bin/grumphp run
diff --git a/composer.json b/composer.json
index 0beb1c5..31f836b 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
     "issues": "https://github.com/pluswerk/grumphp-bom-task/issues"
   },
   "require": {
-    "php": "~8.1.0 || ~8.2.0",
+    "php": "~8.1.0 || ~8.2.0 || ~8.3.0",
     "phpro/grumphp": "^2.0.0"
   },
   "require-dev": {
@@ -30,9 +30,9 @@
   ],
   "config": {
     "allow-plugins": {
+      "ergebnis/composer-normalize": true,
       "phpro/grumphp": true,
       "phpstan/extension-installer": true,
-      "ergebnis/composer-normalize": true,
       "pluswerk/grumphp-config": true
     }
   },
diff --git a/src/BomFixerTask.php b/src/BomFixerTask.php
index dad070f..794df1f 100644
--- a/src/BomFixerTask.php
+++ b/src/BomFixerTask.php
@@ -99,7 +99,7 @@ private function isFileWithBOM(string $filename): bool
     private function fileInfoSearch(string $filename, string $search): bool
     {
         $output = [];
-        exec('file ' . '"' . $filename . '"', $output, $returnVar);
+        exec('file "' . $filename . '"', $output, $returnVar);
         if ($returnVar !== 0) {
             return false;
         }