diff --git a/composer.json b/composer.json
index b7eb05f..d82549b 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     ],
     "require":
     {
-        "silverstripe/framework": "^4.0"
+        "silverstripe/framework": "^4 || ^5"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/SingleObjectAdmin.php b/src/SingleObjectAdmin.php
index 0e54f73..248debe 100644
--- a/src/SingleObjectAdmin.php
+++ b/src/SingleObjectAdmin.php
@@ -172,7 +172,7 @@ public function EditForm($request = null)
      *
      * @return DBHTMLText|string
      */
-    public function getSilverStripeNavigator()
+    public function getSilverStripeNavigator(?DataObject $record = null)
     {
         return $this->renderWith(SingleObjectAdmin::class . '_SilverStripeNavigator');
     }
@@ -180,7 +180,7 @@ public function getSilverStripeNavigator()
     /**
      * @return PjaxResponseNegotiator
      */
-    public function getResponseNegotiator()
+    public function getResponseNegotiator(): PjaxResponseNegotiator
     {
         $neg = parent::getResponseNegotiator();
         $controller = $this;