diff --git a/.travis.yml b/.travis.yml
index da52bb1..8e65657 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,7 @@ php:
   - 5.5
   - 5.6
   - 7.0
+  - 7.1
 
 env:
   global:
@@ -36,9 +37,9 @@ before_script:
   - cp phpunit.xml.dist phpunit.xml
 
 script:
-  - sh -c "if [ '$DEFAULT' = '1' ]; then phpunit --stderr; fi"
+  - sh -c "if [ '$DEFAULT' = '1' ]; then vendor/bin/phpunit --stderr; fi"
   - sh -c "if [ '$PHPCS' = '1' ]; then vendor/bin/phpcs -p --extensions=php --standard=ruleset.xml ./src; fi"
-  - sh -c "if [ '$COVERALLS' = '1' ]; then phpunit --stderr --coverage-clover build/logs/clover.xml; fi"
+  - sh -c "if [ '$COVERALLS' = '1' ]; then vendor/bin/phpunit --stderr --coverage-clover build/logs/clover.xml; fi"
 
 after_script:
   - sh -c "if [ '$COVERALLS' = '1' ]; then php vendor/bin/coveralls -c .coveralls.yml -v; fi"
diff --git a/composer.json b/composer.json
index d6a74e3..3f7d609 100755
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
         "fzaninotto/faker": "~1.4"
     },
     "require-dev": {
-        "phpunit/phpunit": "*"
+        "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.0"
     },
     "suggest": {
         "sizuhiko/cake_fabricate": "for integration with CakePHP3"
diff --git a/tests/Case/Fabricate/Definition/FabricateDefinitionTest.php b/tests/Case/Fabricate/Definition/FabricateDefinitionTest.php
index 81af880..3aa3dac 100644
--- a/tests/Case/Fabricate/Definition/FabricateDefinitionTest.php
+++ b/tests/Case/Fabricate/Definition/FabricateDefinitionTest.php
@@ -1,12 +1,13 @@
-<?php 
+<?php
 namespace Test\Fabricate\Definition;
 
 use Fabricate\Definition\FabricateDefinition;
+use PHPUnit\Framework\TestCase;
 
 /**
  * FabricateDefinition class test case
  */
-class FabricateDefinitionTest extends \PHPUnit_Framework_TestCase {
+class FabricateDefinitionTest extends TestCase {
     public function testRunCallbackDefinition() {
         $target = new FabricateDefinition(function($data, $world) {
             $this->assertEquals(['name'=>'taro'], $data);
@@ -25,4 +26,4 @@ public function testRunNullDefinition() {
         $target = new FabricateDefinition(null);
         $this->assertEquals([], $target->run(['name'=>'taro'], 'world'));
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Case/Fabricate/FabricateContextTest.php b/tests/Case/Fabricate/FabricateContextTest.php
index db98275..7f76777 100644
--- a/tests/Case/Fabricate/FabricateContextTest.php
+++ b/tests/Case/Fabricate/FabricateContextTest.php
@@ -1,13 +1,14 @@
-<?php 
+<?php
 namespace Test\Fabricate;
 
 use Fabricate\FabricateConfig;
 use Fabricate\FabricateContext;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Fabricate class test case
  */
-class FabricateContextTest extends \PHPUnit_Framework_TestCase {
+class FabricateContextTest extends TestCase {
 
     public function setUp() {
         $this->Config = new FabricateConfig();
@@ -53,4 +54,4 @@ public function testGetFakerInstance() {
         $this->Config->faker = \Faker\Factory::create();
         $this->assertSame($this->Config->faker, $this->Context->faker());
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Case/Fabricate/FabricateRegistryTest.php b/tests/Case/Fabricate/FabricateRegistryTest.php
index 92c69b4..0fb35ab 100644
--- a/tests/Case/Fabricate/FabricateRegistryTest.php
+++ b/tests/Case/Fabricate/FabricateRegistryTest.php
@@ -1,14 +1,15 @@
-<?php 
+<?php
 namespace Test\Fabricate;
 
 use Fabricate\FabricateRegistry;
 use Fabricate\Adaptor\FabricateArrayAdaptor;
 use Fabricate\Model\FabricateModel;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Fabricate class test case
  */
-class FabricateRegistryTest extends \PHPUnit_Framework_TestCase {
+class FabricateRegistryTest extends TestCase {
     public function setUp() {
         $adaptor = new FabricateArrayAdaptor();
         $adaptor::$definitions = [
@@ -53,4 +54,4 @@ public function testFindThrowExceptionIfRegisteredObjectCleared() {
         $this->Registry->clear();
         $this->Registry->find('FabricateRegistryTestComment');
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Case/Fabricate/FabricateSequenceTest.php b/tests/Case/Fabricate/FabricateSequenceTest.php
index b60004e..619e7fe 100644
--- a/tests/Case/Fabricate/FabricateSequenceTest.php
+++ b/tests/Case/Fabricate/FabricateSequenceTest.php
@@ -1,12 +1,13 @@
-<?php 
+<?php
 namespace Test\Fabricate;
 
 use Fabricate\FabricateSequence;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Fabricate class test case
  */
-class FabricateSequenceTest extends \PHPUnit_Framework_TestCase {
+class FabricateSequenceTest extends TestCase {
 
     public function setUp() {
         $this->Sequence = new FabricateSequence(1);
@@ -20,4 +21,4 @@ public function testNext() {
         $this->assertEquals(2, $this->Sequence->next());
         $this->assertEquals(2, $this->Sequence->current());
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Case/Fabricate/FabricateTest.php b/tests/Case/Fabricate/FabricateTest.php
index 3c388db..0d002b1 100755
--- a/tests/Case/Fabricate/FabricateTest.php
+++ b/tests/Case/Fabricate/FabricateTest.php
@@ -4,11 +4,12 @@
 use Fabricate\Fabricate;
 use Fabricate\Adaptor\FabricateArrayAdaptor;
 use Fabricate\Model\FabricateModel;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Fabricate class test case
  */
-class FabricateTest extends \PHPUnit_Framework_TestCase {
+class FabricateTest extends TestCase {
     public function setUp() {
         parent::setUp();
         Fabricate::clear();
diff --git a/tests/Case/Fabricate/Factory/FabricateFactoryTest.php b/tests/Case/Fabricate/Factory/FabricateFactoryTest.php
index afa0342..6f530e5 100644
--- a/tests/Case/Fabricate/Factory/FabricateFactoryTest.php
+++ b/tests/Case/Fabricate/Factory/FabricateFactoryTest.php
@@ -4,11 +4,12 @@
 use Fabricate\Factory\FabricateFactory;
 use Fabricate\Definition\FabricateDefinition;
 use Fabricate\Model\FabricateModel;
+use PHPUnit\Framework\TestCase;
 
 /**
  * FabricateFactory class test case
  */
-class FabricateFactoryTest extends \PHPUnit_Framework_TestCase {
+class FabricateFactoryTest extends TestCase {
     public function setUp() {
         $this->model = (new FabricateModel('Post'))
             ->addColumn('id', 'integer')
@@ -34,4 +35,4 @@ public function testCreateDefinitionFactory() {
     public function testCreateThrowExceptionIfNotSupportInstance() {
         FabricateFactory::create('Not Supported');
     }
-}
\ No newline at end of file
+}