diff --git a/src/Contract/StaticPublishingTrigger.php b/src/Contract/StaticPublishingTrigger.php
index 2bd76eb1..6472c882 100644
--- a/src/Contract/StaticPublishingTrigger.php
+++ b/src/Contract/StaticPublishingTrigger.php
@@ -15,7 +15,7 @@ interface StaticPublishingTrigger
      * @param array $context An associative array with extra engine-specific information.
      * @return array|SS_List
      */
-    public function objectsToUpdate(array $context);
+    public function objectsToUpdate($context);
 
     /**
      * Provides a SS_list of objects that need to be deleted.
@@ -23,5 +23,5 @@ public function objectsToUpdate(array $context);
      * @param array $context An associative array with extra engine-specific information.
      * @return array|SS_List
      */
-    public function objectsToDelete(array $context);
+    public function objectsToDelete($context);
 }
diff --git a/src/Contract/StaticallyPublishable.php b/src/Contract/StaticallyPublishable.php
index 022938f7..2d730e51 100644
--- a/src/Contract/StaticallyPublishable.php
+++ b/src/Contract/StaticallyPublishable.php
@@ -22,5 +22,5 @@ interface StaticallyPublishable
      *
      * @return array associative array of URL (string) => Priority (int)
      */
-    public function urlsToCache(): array;
+    public function urlsToCache();
 }
diff --git a/src/Extension/Engine/SiteTreePublishingEngine.php b/src/Extension/Engine/SiteTreePublishingEngine.php
index d0154645..660d9d24 100644
--- a/src/Extension/Engine/SiteTreePublishingEngine.php
+++ b/src/Extension/Engine/SiteTreePublishingEngine.php
@@ -8,7 +8,6 @@
 use SilverStripe\Core\Injector\Injector;
 use SilverStripe\Core\Resettable;
 use SilverStripe\ORM\DataObject;
-use SilverStripe\ORM\SS_List;
 use SilverStripe\StaticPublishQueue\Contract\StaticPublishingTrigger;
 use SilverStripe\StaticPublishQueue\Extension\Publishable\PublishableSiteTree;
 use SilverStripe\StaticPublishQueue\Job\DeleteStaticCacheJob;
@@ -35,8 +34,10 @@ class SiteTreePublishingEngine extends SiteTreeExtension implements Resettable
     /**
      * Queued job service injection property
      * Used for unit tests only to cover edge cases where Injector doesn't cover
+     *
+     * @var QueuedJobService|null
      */
-    protected static ?QueuedJobService $queueService = null;
+    protected static $queueService = null;
 
     /**
      * Queues the urls to be flushed into the queue.
@@ -165,8 +166,11 @@ public function onAfterUnpublish()
 
     /**
      * Collect all changes for the given context.
+     *
+     * @param array $context
+     * @return void
      */
-    public function collectChanges(array $context): void
+    public function collectChanges($context)
     {
         Environment::increaseMemoryLimitTo();
         Environment::increaseTimeLimitTo();
diff --git a/src/Extension/Publishable/PublishableSiteTree.php b/src/Extension/Publishable/PublishableSiteTree.php
index 071f55cd..6013666e 100644
--- a/src/Extension/Publishable/PublishableSiteTree.php
+++ b/src/Extension/Publishable/PublishableSiteTree.php
@@ -40,7 +40,7 @@ public function getMyVirtualPages()
     /**
      * @return array|SS_List
      */
-    public function objectsToUpdate(array $context)
+    public function objectsToUpdate($context)
     {
         $list = [];
         $siteTree = $this->getOwner();
@@ -91,7 +91,7 @@ public function objectsToUpdate(array $context)
      *
      * @return array|SS_List
      */
-    public function objectsToDelete(array $context)
+    public function objectsToDelete($context)
     {
         // This context isn't one of our valid actions, so there's nothing to do here
         if ($context['action'] !== SiteTreePublishingEngine::ACTION_UNPUBLISH) {
@@ -130,8 +130,10 @@ public function objectsToDelete(array $context)
 
     /**
      * The only URL belonging to this object is its own URL.
+     *
+     * @return array
      */
-    public function urlsToCache(): array
+    public function urlsToCache()
     {
         $page = $this->getOwner();