diff -u -r src/AbstractDatabase.php src/AbstractDatabase.php
--- src/AbstractDatabase.php	2020-09-22 13:35:16.000000000 -0700
+++ src/AbstractDatabase.php	2022-10-19 07:50:01.878475259 -0700
@@ -147,21 +147,25 @@
     /**
      * @return object
      */
+    #[\ReturnTypeWillChange]
     public function current()
     {
         return $this->arrayToEntry(current($this->clusterIndex));
     }
 
+    #[\ReturnTypeWillChange]
     public function key(): ?int
     {
         return key($this->clusterIndex);
     }
 
+    #[\ReturnTypeWillChange]
     public function next(): void
     {
         next($this->clusterIndex);
     }
 
+    #[\ReturnTypeWillChange]
     public function rewind(): void
     {
         // initialise cluster index
@@ -170,11 +174,13 @@
         reset($this->clusterIndex);
     }
 
+    #[\ReturnTypeWillChange]
     public function valid(): bool
     {
         return $this->key() !== null;
     }
 
+    #[\ReturnTypeWillChange]
     public function count(): int
     {
         return count($this->getClusterIndex());