diff --git a/composer.json b/composer.json
index 5a43ed92..2accad6c 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
         "evenement/evenement": "^3.0 || ^2.0 || ^1.0",
         "react/dns": "^1.1",
         "react/event-loop": "^1.0 || ^0.5",
-        "react/promise": "^2.6.0 || ^1.2.1",
+        "react/promise": "dev-master as 2.999.9999",
         "react/promise-timer": "^1.4.0",
         "react/stream": "^1.1"
     },
diff --git a/tests/DnsConnectorTest.php b/tests/DnsConnectorTest.php
index f6401931..d5dd6920 100644
--- a/tests/DnsConnectorTest.php
+++ b/tests/DnsConnectorTest.php
@@ -26,7 +26,7 @@ public function setUpMocks()
     public function testPassByResolverIfGivenIp()
     {
         $this->resolver->expects($this->never())->method('resolve');
-        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('127.0.0.1:80'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('127.0.0.1:80'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('127.0.0.1:80');
     }
@@ -34,7 +34,7 @@ public function testPassByResolverIfGivenIp()
     public function testPassThroughResolverIfGivenHost()
     {
         $this->resolver->expects($this->once())->method('resolve')->with($this->equalTo('google.com'))->will($this->returnValue(Promise\resolve('1.2.3.4')));
-        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('1.2.3.4:80?hostname=google.com'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('1.2.3.4:80?hostname=google.com'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('google.com:80');
     }
@@ -42,7 +42,7 @@ public function testPassThroughResolverIfGivenHost()
     public function testPassThroughResolverIfGivenHostWhichResolvesToIpv6()
     {
         $this->resolver->expects($this->once())->method('resolve')->with($this->equalTo('google.com'))->will($this->returnValue(Promise\resolve('::1')));
-        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('[::1]:80?hostname=google.com'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('[::1]:80?hostname=google.com'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('google.com:80');
     }
@@ -50,7 +50,7 @@ public function testPassThroughResolverIfGivenHostWhichResolvesToIpv6()
     public function testPassByResolverIfGivenCompleteUri()
     {
         $this->resolver->expects($this->never())->method('resolve');
-        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('scheme://127.0.0.1:80/path?query#fragment'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('scheme://127.0.0.1:80/path?query#fragment'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('scheme://127.0.0.1:80/path?query#fragment');
     }
@@ -58,7 +58,7 @@ public function testPassByResolverIfGivenCompleteUri()
     public function testPassThroughResolverIfGivenCompleteUri()
     {
         $this->resolver->expects($this->once())->method('resolve')->with($this->equalTo('google.com'))->will($this->returnValue(Promise\resolve('1.2.3.4')));
-        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('scheme://1.2.3.4:80/path?query&hostname=google.com#fragment'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('scheme://1.2.3.4:80/path?query&hostname=google.com#fragment'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('scheme://google.com:80/path?query#fragment');
     }
@@ -66,7 +66,7 @@ public function testPassThroughResolverIfGivenCompleteUri()
     public function testPassThroughResolverIfGivenExplicitHost()
     {
         $this->resolver->expects($this->once())->method('resolve')->with($this->equalTo('google.com'))->will($this->returnValue(Promise\resolve('1.2.3.4')));
-        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('scheme://1.2.3.4:80/?hostname=google.de'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('scheme://1.2.3.4:80/?hostname=google.de'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('scheme://google.com:80/?hostname=google.de');
     }
diff --git a/tests/HappyEyeBallsConnectorTest.php b/tests/HappyEyeBallsConnectorTest.php
index 6af7807a..710efeb4 100644
--- a/tests/HappyEyeBallsConnectorTest.php
+++ b/tests/HappyEyeBallsConnectorTest.php
@@ -84,7 +84,7 @@ public function testPassByResolverIfGivenIp()
     public function testPassByResolverIfGivenIpv6()
     {
         $this->resolver->expects($this->never())->method('resolveAll');
-        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('[::1]:80'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('[::1]:80'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('[::1]:80');
 
@@ -94,7 +94,7 @@ public function testPassByResolverIfGivenIpv6()
     public function testPassThroughResolverIfGivenHost()
     {
         $this->resolver->expects($this->exactly(2))->method('resolveAll')->with($this->equalTo('google.com'), $this->anything())->will($this->returnValue(Promise\resolve(array('1.2.3.4'))));
-        $this->tcp->expects($this->exactly(2))->method('connect')->with($this->equalTo('1.2.3.4:80?hostname=google.com'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->exactly(2))->method('connect')->with($this->equalTo('1.2.3.4:80?hostname=google.com'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('google.com:80');
 
@@ -104,7 +104,7 @@ public function testPassThroughResolverIfGivenHost()
     public function testPassThroughResolverIfGivenHostWhichResolvesToIpv6()
     {
         $this->resolver->expects($this->exactly(2))->method('resolveAll')->with($this->equalTo('google.com'), $this->anything())->will($this->returnValue(Promise\resolve(array('::1'))));
-        $this->tcp->expects($this->exactly(2))->method('connect')->with($this->equalTo('[::1]:80?hostname=google.com'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->exactly(2))->method('connect')->with($this->equalTo('[::1]:80?hostname=google.com'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('google.com:80');
 
@@ -114,7 +114,7 @@ public function testPassThroughResolverIfGivenHostWhichResolvesToIpv6()
     public function testPassByResolverIfGivenCompleteUri()
     {
         $this->resolver->expects($this->never())->method('resolveAll');
-        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('scheme://127.0.0.1:80/path?query#fragment'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->once())->method('connect')->with($this->equalTo('scheme://127.0.0.1:80/path?query#fragment'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('scheme://127.0.0.1:80/path?query#fragment');
 
@@ -124,7 +124,7 @@ public function testPassByResolverIfGivenCompleteUri()
     public function testPassThroughResolverIfGivenCompleteUri()
     {
         $this->resolver->expects($this->exactly(2))->method('resolveAll')->with($this->equalTo('google.com'), $this->anything())->will($this->returnValue(Promise\resolve(array('1.2.3.4'))));
-        $this->tcp->expects($this->exactly(2))->method('connect')->with($this->equalTo('scheme://1.2.3.4:80/path?query&hostname=google.com#fragment'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->exactly(2))->method('connect')->with($this->equalTo('scheme://1.2.3.4:80/path?query&hostname=google.com#fragment'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('scheme://google.com:80/path?query#fragment');
 
@@ -134,7 +134,7 @@ public function testPassThroughResolverIfGivenCompleteUri()
     public function testPassThroughResolverIfGivenExplicitHost()
     {
         $this->resolver->expects($this->exactly(2))->method('resolveAll')->with($this->equalTo('google.com'), $this->anything())->will($this->returnValue(Promise\resolve(array('1.2.3.4'))));
-        $this->tcp->expects($this->exactly(2))->method('connect')->with($this->equalTo('scheme://1.2.3.4:80/?hostname=google.de'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->exactly(2))->method('connect')->with($this->equalTo('scheme://1.2.3.4:80/?hostname=google.de'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('scheme://google.com:80/?hostname=google.de');
 
@@ -155,12 +155,12 @@ public function testIpv6ResolvesFirstSoIsTheFirstToConnect(array $ipv6, array $i
             $this->returnValue(Promise\resolve($ipv6)),
             $this->returnValue($deferred->promise())
         );
-        $this->tcp->expects($this->any())->method('connect')->with($this->stringContains(']:80/?hostname=google.com'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->any())->method('connect')->with($this->stringContains(']:80/?hostname=google.com'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('scheme://google.com:80/?hostname=google.com');
 
         $this->loop->addTimer(0.07, function () use ($deferred) {
-            $deferred->reject(new \RuntimeException());
+            $deferred->reject(new \Exception('reject'));
         });
 
         $this->loop->run();
@@ -180,12 +180,12 @@ public function testIpv6DoesntResolvesWhileIpv4DoesFirstSoIpv4Connects(array $ip
             $this->returnValue($deferred->promise()),
             $this->returnValue(Promise\resolve($ipv4))
         );
-        $this->tcp->expects($this->any())->method('connect')->with($this->stringContains(':80/?hostname=google.com'))->will($this->returnValue(Promise\reject()));
+        $this->tcp->expects($this->any())->method('connect')->with($this->stringContains(':80/?hostname=google.com'))->will($this->returnValue(Promise\reject(new \Exception('reject'))));
 
         $this->connector->connect('scheme://google.com:80/?hostname=google.com');
 
         $this->loop->addTimer(0.07, function () use ($deferred) {
-            $deferred->reject(new \RuntimeException());
+            $deferred->reject(new \Exception('reject'));
         });
 
         $this->loop->run();