diff --git a/composer.json b/composer.json
index bc878e6..d5e4e67 100644
--- a/composer.json
+++ b/composer.json
@@ -26,9 +26,9 @@
         "guzzlehttp/guzzle": "~6.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.0",
-        "mockery/mockery": "~0.9",
-        "squizlabs/php_codesniffer": "~2.0"
+        "phpunit/phpunit": "~6.0",
+        "mockery/mockery": "~1.0",
+        "squizlabs/php_codesniffer": "^3.4"
     },
     "autoload": {
         "psr-4": {
diff --git a/tests/src/Provider/LightspeedResourceOwnerTest.php b/tests/src/Provider/LightspeedResourceOwnerTest.php
index ed9287d..8336833 100644
--- a/tests/src/Provider/LightspeedResourceOwnerTest.php
+++ b/tests/src/Provider/LightspeedResourceOwnerTest.php
@@ -4,7 +4,7 @@
 
 use League\OAuth2\Client\Provider\LightspeedResourceOwner;
 
-class LightspeedResourceOwnerTest extends \PHPUnit_Framework_TestCase
+class LightspeedResourceOwnerTest extends \PHPUnit\Framework\TestCase
 {
     /**
      * @var LightspeedResourceOwner
diff --git a/tests/src/Provider/LightspeedTest.php b/tests/src/Provider/LightspeedTest.php
index b6e9442..34e34f0 100644
--- a/tests/src/Provider/LightspeedTest.php
+++ b/tests/src/Provider/LightspeedTest.php
@@ -14,7 +14,7 @@ protected function fetchResourceOwnerDetails(AccessToken $token)
     }
 }
 
-class LightspeedTest extends \PHPUnit_Framework_TestCase
+class LightspeedTest extends \PHPUnit\Framework\TestCase
 {
 
     /**