diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 7df6988..48ce16a 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -14,6 +14,7 @@ jobs:
           - 8.1
           - 8.2
           - 8.3
+          - 8.4
         composer_args:
           - '--prefer-stable'
           - '--prefer-stable --prefer-lowest'