diff --git a/composer.json b/composer.json
index fac5fa3..cad0a4c 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
   },
   "require-dev": {
     "ext-openssl": "*",
-    "phpunit/phpunit": "^8 || ^9",
+    "phpunit/phpunit": "^9 || ^10",
     "phpspec/prophecy-phpunit": "^2.0",
     "phpstan/phpstan": "^1.10",
     "squizlabs/php_codesniffer": "~3.5"
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 8d08955..2487bec 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -2,16 +2,16 @@
 <phpunit
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         bootstrap="tests/bootstrap.php"
-        xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
-  <coverage>
-    <include>
-      <directory>src</directory>
-    </include>
-  </coverage>
+        xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd">
   <testsuites>
     <testsuite name="Xero Client Test Suite">
       <directory>tests</directory>
       <exclude>vendor</exclude>
     </testsuite>
   </testsuites>
+  <source>
+    <include>
+      <directory>src</directory>
+    </include>
+  </source>
 </phpunit>
diff --git a/tests/src/XeroProviderTest.php b/tests/src/XeroProviderTest.php
index 055bb8a..7701b73 100644
--- a/tests/src/XeroProviderTest.php
+++ b/tests/src/XeroProviderTest.php
@@ -41,7 +41,7 @@ public function testGetValidScopes(array $expected, ?string $api = ''): void
     /**
      * @return array<int,mixed>
      */
-    public function validScopesProvider(): array
+    public static function validScopesProvider(): array
     {
         return [
             [['offline_access'], null],
@@ -143,7 +143,7 @@ public function testGetResponseMessage(array $data, string $expected): void
      *
      * @return array<string,mixed>
      */
-    public function provideResponseData(): array
+    public static function provideResponseData(): array
     {
         return [
           'invalid client' => [['error' => 'invalid_client'], 'Invalid client credentials'],