diff --git a/.github/workflows/grumphp.yaml b/.github/workflows/grumphp.yaml
index 9db01a1..c379c26 100644
--- a/.github/workflows/grumphp.yaml
+++ b/.github/workflows/grumphp.yaml
@@ -7,7 +7,7 @@ jobs:
         strategy:
             matrix:
                 operating-system: [ubuntu-latest]
-                php-versions: ['8.1', '8.2', '8.3']
+                php-versions: ['8.1', '8.2', '8.3', '8.4']
                 composer-options: ['', '--prefer-lowest']
             fail-fast: false
         name: PHP ${{ matrix.php-versions }} @ ${{ matrix.operating-system }} with ${{ matrix.composer-options }}
@@ -20,6 +20,11 @@ jobs:
                   php-version: ${{ matrix.php-versions }}
                   tools: 'composer:v2'
                   extensions: pcov, mbstring, posix
+            - name: Set env vars for latest PHP version
+              if: matrix.php-versions == '8.4'
+              run: |
+                export COMPOSER_IGNORE_PLATFORM_REQ=php+
+                export BOX_REQUIREMENT_CHECKER=0
             - name: Check Versions
               run: |
                   php -v
diff --git a/composer.json b/composer.json
index 8c6bf4d..3ab162d 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
         }
     ],
     "require": {
-        "php": "~8.1.0 || ~8.2.0 || ~8.3.0",
+        "php": "~8.1.0 || ~8.2.0 || ~8.3.0 || ~8.4.0",
         "phpro/api-problem": "^1.0",
         "symfony/dependency-injection": "^5.4 || ^6.0 || ^7.0",
         "symfony/event-dispatcher": "^5.4 || ^6.0 || ^7.0",
@@ -19,7 +19,7 @@
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.39",
         "matthiasnoback/symfony-dependency-injection-test": "^4.3",
-        "phpro/grumphp-shim": "^2.3",
+        "phpro/grumphp-shim": "^2.10",
         "phpspec/prophecy-phpunit": "^2.0",
         "phpspec/prophecy": "^1.17",
         "phpunit/phpunit": "^9.5",