diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 003cd6d..e489312 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -32,6 +32,8 @@ jobs:
                       dependency-versions: 'lowest'
                     - php-version: '8.2'
                       dependency-versions: 'highest'
+                    - php-version: '8.3'
+                      dependency-versions: 'highest'
 
         steps:
             - name: Checkout project
diff --git a/composer.json b/composer.json
index 0774c0c..abb9888 100644
--- a/composer.json
+++ b/composer.json
@@ -23,6 +23,9 @@
         "sulu/sulu": "^2.5@dev",
         "thecodingmachine/phpstan-strict-rules": "^1.0"
     },
+    "conflict": {
+        "phpstan/phpstan": ">=1.10.55"
+    },
     "autoload": {
         "psr-4": {
             "Sulu\\Rector\\": "src"