diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 17317287..a27c3e21 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         dependencies: [ "lowest", "locked", "highest" ]
-        php-version: [ "8.1", "8.2", "8.3" ]
+        php-version: [ "8.1", "8.2", "8.3", "8.4" ]
         operating-system:
           - "ubuntu-latest"
 #          - "windows-latest" # TODO: Windows is not working in the CI at the moment for some reason