diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index c4d5f194..69b19b03 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -20,6 +20,7 @@ jobs:
         php-version:
           - "8.2"
           - "8.3"
+          - "8.4"
         operating-system:
           - "ubuntu-latest"
 
diff --git a/composer.json b/composer.json
index 77ae9a10..5e69871b 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         }
     ],
     "require": {
-        "php": "~8.2.0 || ~8.3.0",
+        "php": "~8.2.0 || ~8.3.0 || ~8.4.0",
         "ext-openssl": "*",
         "ext-sodium": "*",
         "psr/clock": "^1.0"
diff --git a/composer.lock b/composer.lock
index b9e96d71..41bceedc 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": "c85e0599656b6101658fa392c66f8dc7",
+    "content-hash": "f6da93713398752c6e06805659ca09e4",
     "packages": [
         {
             "name": "psr/clock",
@@ -5034,7 +5034,7 @@
     "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-openssl": "*",
         "ext-sodium": "*"
     },