diff --git a/composer.json b/composer.json
index fe6e8734..4f180d57 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
         }
     ],
     "require": {
-        "php": "^7.3",
+        "php": "^7.3|^8.0",
         "ql/uri-template": "^1.1",
         "webmozart/assert": "^1.2",
         "guzzlehttp/guzzle": "^6.3|^7.0.1"
diff --git a/tests/Webhooks/IncomingWebhookTest.php b/tests/Webhooks/IncomingWebhookTest.php
index 771b6f4a..76606067 100644
--- a/tests/Webhooks/IncomingWebhookTest.php
+++ b/tests/Webhooks/IncomingWebhookTest.php
@@ -15,7 +15,7 @@
 
 class IncomingWebhookTest extends TestCase
 {
-    protected function createRequest(array $headers = [], string $body)
+    protected function createRequest(array $headers, string $body)
     {
         return new Request('POST', 'www.blah.blah', $headers, $body);
     }