diff --git a/README.md b/README.md
index 59cd261..8c95436 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Use [Composer](https://getcomposer.org/):
 
 PHP-Mock integrates with the trait
 [`PHPMock`](http://php-mock.github.io/php-mock-phpunit/api/class-phpmock.phpunit.PHPMock.html)
-into your PHPUnit-4 test case. This trait extends the framework
+into your PHPUnit-4 or PHPUnit-5 test case. This trait extends the framework
 by the method
 [`getFunctionMock()`](http://php-mock.github.io/php-mock-phpunit/api/class-phpmock.phpunit.PHPMock.html#_getFunctionMock).
 With this method you can build a mock in the way you are used to build a
diff --git a/composer.json b/composer.json
index 453cf3d..c931d38 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
     },
     "require": {
         "php": ">=5.5",
-        "phpunit/phpunit": "^4.0.0",
+        "phpunit/phpunit": "^4.0.0 || ^5.0.0",
         "php-mock/php-mock-integration": "^0.4"
     },
     "require-dev": {