diff --git a/composer.json b/composer.json
index 6102250..ddfc6c8 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
     "require": {
         "php": ">=5.3",
         "react/event-loop": "^1.2",
-        "react/promise": "^2.7 || ^1.2.1",
+        "react/promise": "^3.0 || ^2.7 || ^1.2.1",
         "react/promise-timer": "^1.5"
     },
     "require-dev": {
diff --git a/src/functions.php b/src/functions.php
index ae98981..cf23fc0 100644
--- a/src/functions.php
+++ b/src/functions.php
@@ -196,9 +196,9 @@ function ($error) use (&$exception, &$rejected, &$wait, $loop) {
  * value, it will still start a timer and will thus trigger at the earliest
  * possible time in the future.
  *
- * @param array          $promises
- * @param ?LoopInterface $loop
- * @param ?float         $timeout [deprecated] (optional) maximum timeout in seconds or null=wait forever
+ * @param PromiseInterface[]  $promises
+ * @param ?LoopInterface      $loop
+ * @param ?float              $timeout [deprecated] (optional) maximum timeout in seconds or null=wait forever
  * @return mixed returns whatever the first promise resolves to
  * @throws Exception if ALL promises are rejected
  * @throws TimeoutException if the $timeout is given and triggers
@@ -287,9 +287,9 @@ function awaitAny(array $promises, LoopInterface $loop = null, $timeout = null)
  * value, it will still start a timer and will thus trigger at the earliest
  * possible time in the future.
  *
- * @param array          $promises
- * @param ?LoopInterface $loop
- * @param ?float         $timeout [deprecated] (optional) maximum timeout in seconds or null=wait forever
+ * @param PromiseInterface[]  $promises
+ * @param ?LoopInterface      $loop
+ * @param ?float              $timeout [deprecated] (optional) maximum timeout in seconds or null=wait forever
  * @return array returns an array with whatever each promise resolves to
  * @throws Exception when ANY promise is rejected
  * @throws TimeoutException if the $timeout is given and triggers
@@ -322,7 +322,7 @@ function awaitAll(array $promises, LoopInterface $loop = null, $timeout = null)
 function _cancelAllPromises(array $promises)
 {
     foreach ($promises as $promise) {
-        if ($promise instanceof CancellablePromiseInterface) {
+        if ($promise instanceof PromiseInterface && ($promise instanceof CancellablePromiseInterface || !\interface_exists('React\Promise\CancellablePromiseInterface'))) {
             $promise->cancel();
         }
     }
diff --git a/tests/FunctionAwaitAllTest.php b/tests/FunctionAwaitAllTest.php
index cc6e645..282046b 100644
--- a/tests/FunctionAwaitAllTest.php
+++ b/tests/FunctionAwaitAllTest.php
@@ -43,6 +43,10 @@ public function testAwaitAllRejected()
 
     public function testAwaitAllRejectedWithFalseWillWrapInUnexpectedValueException()
     {
+        if (!interface_exists('React\Promise\CancellablePromiseInterface')) {
+            $this->markTestSkipped('Promises must be rejected with a \Throwable instance since Promise v3');
+        }
+
         $all = array(
             $this->createPromiseResolved(1),
             Promise\reject(false)
diff --git a/tests/FunctionAwaitAnyTest.php b/tests/FunctionAwaitAnyTest.php
index 58539dd..d6d0b16 100644
--- a/tests/FunctionAwaitAnyTest.php
+++ b/tests/FunctionAwaitAnyTest.php
@@ -18,7 +18,7 @@ public function testAwaitAnyEmpty()
     public function testAwaitAnyFirstResolved()
     {
         $all = array(
-            $this->createPromiseRejected(1),
+            $this->createPromiseRejected(new \Exception('1')),
             $this->createPromiseResolved(2, 0.01),
             $this->createPromiseResolved(3, 0.02)
         );
@@ -40,7 +40,7 @@ public function testAwaitAnyFirstResolvedConcurrently()
         $d3 = new Deferred();
 
         $this->loop->addTimer(0.01, function() use ($d1, $d2, $d3) {
-            $d1->reject(1);
+            $d1->reject(new \Exception('1'));
             $d2->resolve(2);
             $d3->resolve(3);
         });
@@ -57,8 +57,8 @@ public function testAwaitAnyFirstResolvedConcurrently()
     public function testAwaitAnyAllRejected()
     {
         $all = array(
-            $this->createPromiseRejected(1),
-            $this->createPromiseRejected(2)
+            $this->createPromiseRejected(new \Exception('1')),
+            $this->createPromiseRejected(new \Exception('2'))
         );
 
         $this->setExpectedException('UnderflowException');
diff --git a/tests/FunctionAwaitTest.php b/tests/FunctionAwaitTest.php
index 41c95f5..67227b7 100644
--- a/tests/FunctionAwaitTest.php
+++ b/tests/FunctionAwaitTest.php
@@ -18,6 +18,10 @@ public function testAwaitOneRejected()
 
     public function testAwaitOneRejectedWithFalseWillWrapInUnexpectedValueException()
     {
+        if (!interface_exists('React\Promise\CancellablePromiseInterface')) {
+            $this->markTestSkipped('Promises must be rejected with a \Throwable instance since Promise v3');
+        }
+
         $promise = Promise\reject(false);
 
         $this->setExpectedException('UnexpectedValueException', 'Promise rejected with unexpected value of type bool');
@@ -26,6 +30,10 @@ public function testAwaitOneRejectedWithFalseWillWrapInUnexpectedValueException(
 
     public function testAwaitOneRejectedWithNullWillWrapInUnexpectedValueException()
     {
+        if (!interface_exists('React\Promise\CancellablePromiseInterface')) {
+            $this->markTestSkipped('Promises must be rejected with a \Throwable instance since Promise v3');
+        }
+
         $promise = Promise\reject(null);
 
         $this->setExpectedException('UnexpectedValueException', 'Promise rejected with unexpected value of type NULL');
@@ -162,6 +170,10 @@ public function testAwaitOneRejectedWithTimeoutShouldNotCreateAnyGarbageReferenc
 
     public function testAwaitNullValueShouldNotCreateAnyGarbageReferences()
     {
+        if (!interface_exists('React\Promise\CancellablePromiseInterface')) {
+            $this->markTestSkipped('Promises must be rejected with a \Throwable instance since Promise v3');
+        }
+
         if (class_exists('React\Promise\When') && PHP_VERSION_ID >= 50400) {
             $this->markTestSkipped('Not supported on legacy Promise v1 API with PHP 5.4+');
         }