diff --git a/.gitignore b/.gitignore
index 5826402..7cfd555 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 composer.phar
 composer.lock
 .DS_Store
+.phpunit.result.cache
diff --git a/composer.json b/composer.json
index 6bb70a4..534d3e9 100644
--- a/composer.json
+++ b/composer.json
@@ -13,11 +13,11 @@
     ],
     "minimum-stability": "dev",
     "require": {
-        "php": ">=5.6"
+        "php": ">=7.2"
     },
     "require-dev": {
-        "squizlabs/php_codesniffer": "^2.8",
-        "phpunit/phpunit": "5.7"
+        "phpunit/phpunit": "8.*",
+        "squizlabs/php_codesniffer": "3.*"
     },
     "autoload": {
         "psr-4": { "PostTypes\\": "src/" }
diff --git a/tests/ColumnsTest.php b/tests/ColumnsTest.php
index 0cf08f9..65c3359 100644
--- a/tests/ColumnsTest.php
+++ b/tests/ColumnsTest.php
@@ -5,7 +5,7 @@
 
 class ColumnsTest extends TestCase
 {
-    public function setUp()
+    protected function setUp(): void
     {
         $this->columns = new Columns;
     }
diff --git a/tests/PostTypeTest.php b/tests/PostTypeTest.php
index b5467a3..712b6b4 100644
--- a/tests/PostTypeTest.php
+++ b/tests/PostTypeTest.php
@@ -6,7 +6,8 @@
 
 class PostTypeTest extends TestCase
 {
-    public function setUp() {
+    protected function setUp(): void
+    {
         // setup basic PostType
         $this->books = new PostType('book');
     }
diff --git a/tests/TaxonomyTest.php b/tests/TaxonomyTest.php
index 0d4cf5b..60a340a 100644
--- a/tests/TaxonomyTest.php
+++ b/tests/TaxonomyTest.php
@@ -6,7 +6,7 @@
 
 class TaxonomyTest extends TestCase
 {
-    public function setUp()
+    protected function setUp(): void
     {
         $this->genres = new Taxonomy('genre');
     }