diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 50e7ab5..ebee202 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -9,7 +9,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [ubuntu-latest]
-        php: [8.2, 8.1, 8.0]
+        php: [8.3, 8.2, 8.1, 8.0]
         dependency-version: [prefer-lowest, prefer-stable]
 
     name: P${{ matrix.php }} - ${{ matrix.dependency-version }} - ${{ matrix.os }}
diff --git a/composer.json b/composer.json
index 330adf1..f5642f6 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
         "symfony/console": "<5.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "^11.0"
+        "phpunit/phpunit": "^8.6 | ^9.0 | ^11.0"
     },
     "autoload": {
         "psr-4": {