diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index dc67285..030036d 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [ '8.1', '8.2', '8.3' ]
+        php: [ '8.1', '8.2', '8.3', '8.4' ]
         ext_base: [ 'none, dom, tokenizer, xml, xmlwriter,' ]
         ext_lib: [ 'curl, mbstring, openssl,' ]
         ext_optional: [ '', 'bcmath', 'gmp' ]
@@ -68,6 +68,7 @@ jobs:
         run: composer test:typing
 
       - name: Run php-cs-fixer
+        if:  ${{ matrix.php != '8.4' }}
         run: |
           composer test:syntax
           composer test:syntax_tests
diff --git a/composer.json b/composer.json
index 869b00c..0f012f4 100644
--- a/composer.json
+++ b/composer.json
@@ -33,7 +33,7 @@
     "ext-json": "*",
     "ext-mbstring": "*",
     "ext-openssl": "*",
-    "guzzlehttp/guzzle": "^7.4.5",
+    "guzzlehttp/guzzle": "^7.9.2",
     "web-token/jwt-library": "^3.3.0|^4.0.0",
     "spomky-labs/base64url": "^2.0.4"
   },