diff --git a/composer.json b/composer.json
index 795a50f..c545bc0 100644
--- a/composer.json
+++ b/composer.json
@@ -26,7 +26,7 @@
     "require-dev": {
         "guzzlehttp/psr7": "^1.0",
         "php-http/client-integration-tests": "dev-master",
-        "phpunit/phpunit": "^4.8.27",
+        "phpunit/phpunit": "^7.0",
         "zendframework/zend-diactoros": "^1.0"
     },
     "autoload": {
diff --git a/tests/PromiseCoreTest.php b/tests/PromiseCoreTest.php
index 081a9f9..9df678b 100644
--- a/tests/PromiseCoreTest.php
+++ b/tests/PromiseCoreTest.php
@@ -21,7 +21,7 @@ class PromiseCoreTest extends BaseUnitTestCase
      */
     public function testHandleIsNotAResource()
     {
-        $this->setExpectedException(
+        $this->expectException(
             \InvalidArgumentException::class,
             'Parameter $handle expected to be a cURL resource, NULL given'
         );
@@ -38,7 +38,7 @@ public function testHandleIsNotAResource()
      */
     public function testHandleIsNotACurlResource()
     {
-        $this->setExpectedException(
+        $this->expectException(
             \InvalidArgumentException::class,
             'Parameter $handle expected to be a cURL resource, stream resource given'
         );