diff --git a/.dagger/versions_pinned.go b/.dagger/versions_pinned.go
index 5ca8810..9290db9 100644
--- a/.dagger/versions_pinned.go
+++ b/.dagger/versions_pinned.go
@@ -3,6 +3,7 @@ package main
 const (
 	goVersion = "1.23.4"
 
+	// update to 8.4 once php-cs-fixer supports it
 	defaultPhpVersion = "8.3"
 
 	composerVersion = "2.8.4"
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 5af2fd8..392c458 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: ["7.4", "8.0", "8.1", "8.2", "8.3"]
+        php: ["7.4", "8.0", "8.1", "8.2", "8.3", "8.4"]
 
     steps:
       - name: Checkout repository