diff --git a/src/Token/AccessTokenInterface.php b/src/Token/AccessTokenInterface.php
index c5f13350..5fd219ff 100644
--- a/src/Token/AccessTokenInterface.php
+++ b/src/Token/AccessTokenInterface.php
@@ -15,6 +15,7 @@
 namespace League\OAuth2\Client\Token;
 
 use JsonSerializable;
+use ReturnTypeWillChange;
 use RuntimeException;
 
 interface AccessTokenInterface extends JsonSerializable
@@ -68,5 +69,6 @@ public function __toString();
      *
      * @return array
      */
+    #[ReturnTypeWillChange]
     public function jsonSerialize();
 }