diff --git a/CHANGELOG.md b/CHANGELOG.md
index a10d4e9..aff2be5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,9 @@
 # Change Log
+## 1.2.2
+
+### Added - 2025-10-31
+
+- Compatibility with PHP 8.4
 
 ## 1.2.1
 
diff --git a/src/FulfilledPromise.php b/src/FulfilledPromise.php
index c9158e7..58465ae 100644
--- a/src/FulfilledPromise.php
+++ b/src/FulfilledPromise.php
@@ -29,7 +29,7 @@ public function __construct($result)
     /**
      * {@inheritdoc}
      */
-    public function then(callable $onFulfilled = null, callable $onRejected = null)
+    public function then(?callable $onFulfilled = null, ?callable $onRejected = null)
     {
         if (null === $onFulfilled) {
             return $this;
diff --git a/src/Promise.php b/src/Promise.php
index 81434ae..642f32c 100644
--- a/src/Promise.php
+++ b/src/Promise.php
@@ -45,7 +45,7 @@ interface Promise
      *
      * @template V
      */
-    public function then(callable $onFulfilled = null, callable $onRejected = null);
+    public function then(?callable $onFulfilled = null, ?callable $onRejected = null);
 
     /**
      * Returns the state of the promise, one of PENDING, FULFILLED or REJECTED.
diff --git a/src/RejectedPromise.php b/src/RejectedPromise.php
index a500048..51412be 100644
--- a/src/RejectedPromise.php
+++ b/src/RejectedPromise.php
@@ -26,7 +26,7 @@ public function __construct(\Exception $exception)
     /**
      * {@inheritdoc}
      */
-    public function then(callable $onFulfilled = null, callable $onRejected = null)
+    public function then(?callable $onFulfilled = null, ?callable $onRejected = null)
     {
         if (null === $onRejected) {
             return $this;