diff --git a/.github/workflows/infection.yml b/.github/workflows/infection.yml
index 3671bdcf..80af15f2 100644
--- a/.github/workflows/infection.yml
+++ b/.github/workflows/infection.yml
@@ -19,6 +19,7 @@ jobs:
         php-version:
           - "8.2"
           - "8.3"
+          - "8.4"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 337ebfd3..96df921b 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -21,6 +21,7 @@ jobs:
                 php-version:
                     - "8.2"
                     - "8.3"
+                    - "8.4"
                 operating-system:
                     - "ubuntu-latest"
                     - "windows-latest"
diff --git a/composer.json b/composer.json
index 063cdcd0..910b5f2f 100644
--- a/composer.json
+++ b/composer.json
@@ -26,7 +26,7 @@
         }
     ],
     "require": {
-        "php": "~8.2.0 || ~8.3.0",
+        "php": "~8.2.0 || ~8.3.0 || ~8.4.0",
         "ext-phar": "*",
         "composer-runtime-api": "^2.0.0",
         "nikic/php-parser": "^4.19.1",
diff --git a/composer.lock b/composer.lock
index 289909bd..475eff07 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "e1a075198cee989467d041049759cf82",
+    "content-hash": "5d3f4f467771d4c18d35e49f69859d4d",
     "packages": [
         {
             "name": "nikic/php-parser",
@@ -5274,7 +5274,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": "~8.2.0 || ~8.3.0",
+        "php": "~8.2.0 || ~8.3.0 || ~8.4.0",
         "ext-phar": "*",
         "composer-runtime-api": "^2.0.0"
     },