diff --git a/.github/workflows/unit.yml b/.github/workflows/unit.yml
index a52f948d..81f3c036 100644
--- a/.github/workflows/unit.yml
+++ b/.github/workflows/unit.yml
@@ -34,6 +34,14 @@ jobs:
                     - dependencies: "locked"
                       php-version: "8.3"
                       operating-system: "windows-latest"
+                    - dependencies: "highest"
+                      php-version: "8.4"
+                      operating-system: "ubuntu-latest"
+                      composer-flags: "--ignore-platform-req=php+"
+                    - dependencies: "highest"
+                      php-version: "8.4"
+                      operating-system: "windows-latest"
+                      composer-options: "--ignore-platform-req=php+"
 
         steps:
             - name: "Checkout"
@@ -50,6 +58,7 @@ jobs:
             - uses: ramsey/composer-install@3.0.0
               with:
                 dependency-versions: ${{ matrix.dependencies }}
+                composer-options: ${{ matrix.composer-options }}
 
             - name: "Tests"
               run: "vendor/bin/phpunit --testsuite=unit --coverage-clover=clover.xml --coverage-text"
diff --git a/composer.json b/composer.json
index 4433d3da..898b1eb1 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
     }
   ],
   "require": {
-    "php": "~8.1.0 || ~8.2.0 || ~8.3.0",
+    "php": "~8.1.0 || ~8.2.0 || ~8.3.0 || ~8.4.0",
     "doctrine/dbal": "^4.0.0",
     "doctrine/migrations": "^3.3.2",
     "patchlevel/hydrator": "^1.5.0",