diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 6f0cd3c..d26272f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -15,6 +15,7 @@ jobs:
           - "8.1"
           - "8.2"
           - "8.3"
+          - "8.4"
 
     runs-on: ubuntu-latest
 
diff --git a/composer.json b/composer.json
index 9ac6421..5c52a58 100644
--- a/composer.json
+++ b/composer.json
@@ -47,7 +47,7 @@
             "@phpunit"
         ],
         "check-cs": [
-            "php-cs-fixer fix --dry-run --diff"
+            "PHP_CS_FIXER_IGNORE_ENV=true php-cs-fixer fix --dry-run --diff"
         ],
         "fix-cs": [
             "php-cs-fixer fix"