diff --git a/.travis.yml b/.travis.yml
index a207061..dd80848 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,8 +13,10 @@ env:
   - PHPUNIT_VERSION=~6.2.0
   - PHPUNIT_VERSION=~6.3.0
   - PHPUNIT_VERSION=~6.4.0
+  - PHPUNIT_VERSION=~6.5.0
 
 php:
+  - 7.2
   - 7.1
   - 7.0
   - hhvm
diff --git a/autoload.php b/autoload.php
new file mode 100644
index 0000000..fbac68f
--- /dev/null
+++ b/autoload.php
@@ -0,0 +1,29 @@
+<?php
+
+if (! interface_exists(\PHPUnit\Framework\MockObject\Matcher\Invocation::class)) {
+    class_alias(
+        \PHPUnit_Framework_MockObject_Matcher_Invocation::class,
+        \PHPUnit\Framework\MockObject\Matcher\Invocation::class
+    );
+}
+
+if (! interface_exists(\PHPUnit\Framework\MockObject\Invocation::class)) {
+    class_alias(
+        \PHPUnit_Framework_MockObject_Invocation::class,
+        \PHPUnit\Framework\MockObject\Invocation::class
+    );
+}
+
+if (! interface_exists(\PHPUnit\Framework\MockObject\MockObject::class)) {
+    class_alias(
+        \PHPUnit_Framework_MockObject_MockObject::class,
+        \PHPUnit\Framework\MockObject\MockObject::class
+    );
+}
+
+if (! class_exists(\PHPUnit\Framework\MockObject\Builder\InvocationMocker::class)) {
+    class_alias(
+        \PHPUnit_Framework_MockObject_Builder_InvocationMocker::class,
+        \PHPUnit\Framework\MockObject\Builder\InvocationMocker::class
+    );
+}
diff --git a/classes/DefaultArgumentRemover.php b/classes/DefaultArgumentRemover.php
index 1b0f15e..c7d5cd8 100644
--- a/classes/DefaultArgumentRemover.php
+++ b/classes/DefaultArgumentRemover.php
@@ -3,6 +3,8 @@
 namespace phpmock\phpunit;
 
 use phpmock\generator\MockFunctionGenerator;
+use PHPUnit\Framework\MockObject\Invocation;
+use PHPUnit\Framework\MockObject\Matcher\Invocation as InvocationInterface;
 
 /**
  * Removes default arguments from the invocation.
@@ -12,22 +14,41 @@
  * @license http://www.wtfpl.net/txt/copying/ WTFPL
  * @internal
  */
-class DefaultArgumentRemover implements \PHPUnit_Framework_MockObject_Matcher_Invocation
+class DefaultArgumentRemover implements InvocationInterface
 {
 
     /**
      * @SuppressWarnings(PHPMD)
      */
-    public function invoked(\PHPUnit_Framework_MockObject_Invocation $invocation)
+    public function invoked(Invocation $invocation)
     {
     }
 
     /**
      * @SuppressWarnings(PHPMD)
      */
-    public function matches(\PHPUnit_Framework_MockObject_Invocation $invocation)
+    public function matches(Invocation $invocation)
     {
-        MockFunctionGenerator::removeDefaultArguments($invocation->parameters);
+        $r = new \ReflectionObject($invocation);
+        $method = $r->hasMethod('getParameters');
+
+        if ($method) {
+            $params = $invocation->getParameters();
+        } else {
+            $params = &$invocation->parameters;
+        }
+
+        MockFunctionGenerator::removeDefaultArguments($params);
+
+        if ($method) {
+            while (! $r->hasProperty('parameters')) {
+                $r = $r->getParentClass();
+            }
+            $p = $r->getProperty('parameters');
+            $p->setAccessible(true);
+            $p->setValue($invocation, $params);
+        }
+
         return false;
     }
 
diff --git a/classes/MockObjectProxy.php b/classes/MockObjectProxy.php
index 4776822..0132be0 100644
--- a/classes/MockObjectProxy.php
+++ b/classes/MockObjectProxy.php
@@ -2,7 +2,8 @@
 
 namespace phpmock\phpunit;
 
-use PHPUnit_Framework_MockObject_MockObject as MockObject;
+use PHPUnit\Framework\MockObject\Matcher\Invocation;
+use PHPUnit\Framework\MockObject\MockObject;
 use phpmock\integration\MockDelegateFunctionBuilder;
 
 /**
@@ -61,7 +62,7 @@ public function __phpunit_verify()
         return $this->mockObject->__phpunit_verify();
     }
 
-    public function expects(\PHPUnit_Framework_MockObject_Matcher_Invocation $matcher)
+    public function expects(Invocation $matcher)
     {
         return $this->mockObject->expects($matcher)->method(MockDelegateFunctionBuilder::METHOD);
     }
diff --git a/classes/PHPMock.php b/classes/PHPMock.php
index 3746ad2..a63ebfa 100644
--- a/classes/PHPMock.php
+++ b/classes/PHPMock.php
@@ -5,6 +5,7 @@
 use phpmock\integration\MockDelegateFunctionBuilder;
 use phpmock\MockBuilder;
 use phpmock\Deactivatable;
+use PHPUnit\Framework\MockObject\MockObject;
 
 /**
  * Adds building a function mock functionality into \PHPUnit\Framework\TestCase.
@@ -42,7 +43,7 @@ trait PHPMock
      * This method exists in \PHPUnit\Framework\TestCase.
      *
      * @param string $className Name of the class to mock.
-     * @return \PHPUnit_Framework_MockObject_MockBuilder
+     * @return \PHPUnit\Framework\MockObject\MockBuilder
      * @see \PHPUnit\Framework\TestCase::getMockBuilder()
      * @internal
      */
@@ -67,7 +68,7 @@ abstract protected function getTestResultObject();
      * @param string $namespace The function namespace.
      * @param string $name      The function name.
      *
-     * @return \PHPUnit_Framework_MockObject_MockObject The PHPUnit mock.
+     * @return MockObject The PHPUnit mock.
      */
     public function getFunctionMock($namespace, $name)
     {
diff --git a/composer.json b/composer.json
index 3739c14..b50f69c 100644
--- a/composer.json
+++ b/composer.json
@@ -14,6 +14,7 @@
         }
     ],
     "autoload": {
+        "files": ["autoload.php"],
         "psr-4": {"phpmock\\phpunit\\": "classes/"}
     },
     "require": {
diff --git a/tests/MockObjectProxyTest.php b/tests/MockObjectProxyTest.php
index d7de226..4bc4edc 100644
--- a/tests/MockObjectProxyTest.php
+++ b/tests/MockObjectProxyTest.php
@@ -2,7 +2,9 @@
 
 namespace phpmock\phpunit;
 
-use \PHPUnit_Framework_MockObject_Builder_InvocationMocker as InvocationMocker;
+use PHPUnit\Framework\MockObject\Builder\InvocationMocker;
+use PHPUnit\Framework\MockObject\Matcher\Invocation;
+use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
 use phpmock\integration\MockDelegateFunctionBuilder;
 
@@ -25,13 +27,13 @@ class MockObjectProxyTest extends TestCase
      */
     public function testExpects()
     {
-        $matcher = $this->getMockBuilder(\PHPUnit_Framework_MockObject_Matcher_Invocation::class)->getMock();
+        $matcher = $this->getMockBuilder(Invocation::class)->getMock();
 
         $invocationMocker = $this->getMockBuilder(InvocationMocker::class)->disableOriginalConstructor()->getMock();
         $invocationMocker->expects($this->once())->method("method")
                 ->with(MockDelegateFunctionBuilder::METHOD)->willReturn($invocationMocker);
 
-        $prophecy = $this->prophesize(\PHPUnit_Framework_MockObject_MockObject::class);
+        $prophecy = $this->prophesize(MockObject::class);
         $prophecy->expects($matcher)->willReturn($invocationMocker);
         $mock = $prophecy->reveal();
 
@@ -53,7 +55,7 @@ public function testExpects()
      */
     public function testHasMatcher()
     {
-        $prophecy = $this->prophesize(\PHPUnit_Framework_MockObject_MockObject::class);
+        $prophecy = $this->prophesize(MockObject::class);
         $prophecy->__phpunit_hasMatchers()->willReturn("foo");
         $mock = $prophecy->reveal();
 
@@ -74,7 +76,7 @@ public function testHasMatcher()
      */
     public function testProxiedMethods($method, array $arguments = [], $expected = "foo")
     {
-        $prophecy = $this->prophesize(\PHPUnit_Framework_MockObject_MockObject::class);
+        $prophecy = $this->prophesize(MockObject::class);
         call_user_func_array([$prophecy, $method], $arguments)->willReturn($expected);
         $mock = $prophecy->reveal();