diff --git a/.travis.yml b/.travis.yml
index 71328b7..36a0b4f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,8 @@ php:
   - 5.4
   - 5.5
   - 5.6
+  - 8.0
+  - 8.1
   - hhvm
 
 env:
diff --git a/src/Phpforce/SoapClient/Result/RecordIterator.php b/src/Phpforce/SoapClient/Result/RecordIterator.php
index 9423a9c..2b9b236 100644
--- a/src/Phpforce/SoapClient/Result/RecordIterator.php
+++ b/src/Phpforce/SoapClient/Result/RecordIterator.php
@@ -58,6 +58,7 @@ public function __construct(Client $client, QueryResult $result)
      * {@inheritdoc}
      * @return object
      */
+    #[\ReturnTypeWillChange]
     public function current()
     {
         return $this->current;
@@ -99,6 +100,7 @@ protected function getObjectAt($pointer)
      *
      * @return int|null
      */
+    #[\ReturnTypeWillChange]
     public function key()
     {
         return $this->pointer;
@@ -107,6 +109,7 @@ public function key()
     /**
      * {@inheritdoc}
      */
+    #[\ReturnTypeWillChange]
     public function next()
     {
         $this->pointer++;
@@ -115,6 +118,7 @@ public function next()
     /**
      * {@inheritdoc}
      */
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         $this->pointer = 0;
@@ -125,6 +129,7 @@ public function rewind()
      *
      * @return boolean
      */
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         return null != $this->getObjectAt($this->pointer);
@@ -170,6 +175,7 @@ protected function queryMore()
      *
      * @return int
      */
+    #[\ReturnTypeWillChange]
     public function count()
     {
         return $this->queryResult->getSize();
@@ -178,6 +184,7 @@ public function count()
     /**
      * @param int $position
      */
+    #[\ReturnTypeWillChange]
     public function seek($position)
     {
         return $this->getObjectAt($position);