diff --git a/composer.json b/composer.json
index 48b7db1..98a53cb 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
         }
     ],
     "require": {
-        "php": "^7.1 || ^8.0",
+        "php": "^7.1 || ^8.0 || ^8.1",
         "ext-sockets": "*",
         "opentracing/opentracing": "^1.0",
         "packaged/thrift": "^0.13",
diff --git a/src/Jaeger/SpanContext.php b/src/Jaeger/SpanContext.php
index 0b7a942..f18eb3d 100644
--- a/src/Jaeger/SpanContext.php
+++ b/src/Jaeger/SpanContext.php
@@ -45,6 +45,7 @@ public function __construct($traceId, $spanId, $parentId, $flags = null, $baggag
     /**
      * {@inheritdoc}
      */
+    #[\ReturnTypeWillChange]
     public function getIterator()
     {
         return new ArrayIterator($this->baggage);