diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 9f281d1..637e476 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -12,7 +12,7 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                php-version: ['7.4', '8.0', '8.1', '8.2', '8.3']
+                php-version: ['7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
                 dependency-versions: ['highest']
         steps:
             - name: Install PHP
@@ -34,4 +34,4 @@ jobs:
                   dependency-versions: ${{ matrix.dependency-versions }}
 
             - name: Run PHPUnit tests
-              run: ./vendor/bin/simple-phpunit
+              run: ./vendor/bin/phpunit
diff --git a/composer.json b/composer.json
index 811cf28..ce2ec1a 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,8 @@
     },
     "require-dev": {
         "dg/bypass-finals": "^1.3",
-        "symfony/phpunit-bridge": "^5.4|^6.0"
+        "symfony/phpunit-bridge": "^5.4|^6.0|^7.0",
+        "phpunit/phpunit": "^9.0|^10.0"
     },
     "config": {
         "sort-packages": true