diff --git a/composer.json b/composer.json
index 7810f56..d85c4ac 100644
--- a/composer.json
+++ b/composer.json
@@ -13,8 +13,7 @@
         "silverstripe/mimevalidator": "2.x-dev"
     },
     "require-dev": {
-        "sminnee/phpunit": "^5.7",
-        "sminnee/phpunit-mock-objects": "^3.4.5"
+        "phpunit/phpunit": "^9"
     },
     "extra": {
         "project-files": [
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 3812f00..55f2bd4 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,7 +1,9 @@
 <phpunit bootstrap="vendor/silverstripe/framework/tests/bootstrap.php" colors="true">
-    <testsuite name="recipe-core">
-        <directory>vendor/silverstripe/assets/tests</directory>
-        <directory>vendor/silverstripe/config/tests</directory>
-        <directory>vendor/silverstripe/framework/tests</directory>
-    </testsuite>
+    <testsuites>
+        <testsuite name="recipe-core">
+            <directory>vendor/silverstripe/assets/tests</directory>
+            <directory>vendor/silverstripe/config/tests</directory>
+            <directory>vendor/silverstripe/framework/tests</directory>
+        </testsuite>
+    </testsuites>
 </phpunit>