diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..94c02ab
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,48 @@
+name: Tests
+on: pull_request
+jobs:
+  phpunit:
+    name: PHP ${{ matrix.php }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php:
+          - "5.3"
+          - "5.4"
+          - "5.5"
+          - "5.6"
+          - "7.0"
+          - "7.1"
+          - "7.2"
+          - "7.3"
+          - "7.4"
+          - "8.0"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          tools: composer:v2
+
+      - name: Update composer
+        run: composer self-update
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install composer packages
+        run: composer update --prefer-dist --no-interaction --no-progress --optimize-autoloader --ansi
+
+      - name: Run phpunit
+        run: vendor/bin/phpunit --color=always
diff --git a/.gitignore b/.gitignore
index d7eee2f..ee1c10a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 phpunit.xml
 composer.lock
 /vendor/
+.phpunit.result.cache
 *.swp
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 5decf5c..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,13 +0,0 @@
-language: php
-dist: trusty
-php:
-  - "7.4"
-  - "7.3"
-  - "7.2"
-  - "7.1"
-  - "7.0"
-  - "5.6"
-  - "5.5"
-  - "5.4"
-install:
-  - composer install
diff --git a/README.md b/README.md
index 2435d90..a3fc05e 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,10 @@
 php-tmpfile
 ===========
 
-[![Build Status](https://secure.travis-ci.org/mikehaertl/php-tmpfile.png)](http://travis-ci.org/mikehaertl/php-tmpfile)
-[![Latest Stable Version](https://poser.pugx.org/mikehaertl/php-tmpfile/v/stable.svg)](https://packagist.org/packages/mikehaertl/php-tmpfile)
-[![Total Downloads](https://poser.pugx.org/mikehaertl/php-tmpfile/downloads)](https://packagist.org/packages/mikehaertl/php-tmpfile)
-[![Latest Unstable Version](https://poser.pugx.org/mikehaertl/php-tmpfile/v/unstable.svg)](https://packagist.org/packages/mikehaertl/php-tmpfile)
-[![License](https://poser.pugx.org/mikehaertl/php-tmpfile/license.svg)](https://packagist.org/packages/mikehaertl/php-tmpfile)
+[![GitHub Tests](https://github.com/mikehaertl/php-tmpfile/workflows/Tests/badge.svg)](https://github.com/mikehaertl/php-tmpfile/actions)
+[![Packagist Version](https://img.shields.io/packagist/v/mikehaertl/php-tmpfile?label=version)](https://packagist.org/packages/mikehaertl/php-tmpfile)
+[![Packagist Downloads](https://img.shields.io/packagist/dt/mikehaertl/php-tmpfile)](https://packagist.org/packages/mikehaertl/php-tmpfile)
+[![GitHub license](https://img.shields.io/github/license/mikehaertl/php-tmpfile)](https://github.com/mikehaertl/php-tmpfile/blob/master/LICENSE)
 
 A convenience class for temporary files.
 
diff --git a/composer.json b/composer.json
index 9e8e0d6..c28c46a 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,8 @@
         }
     ],
     "require-dev": {
-        "phpunit/phpunit": ">4.0 <8"
+        "php": ">=5.3.0",
+        "phpunit/phpunit": ">4.0 <=9.4"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 81123cc..41c86c0 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -8,7 +8,6 @@
          convertWarningsToExceptions="true"
          processIsolation="false"
          stopOnFailure="false"
-         syntaxCheck="false"
          bootstrap="./tests/bootstrap.php"
 >
     <testsuites>
diff --git a/tests/FileTest.php b/tests/FileTest.php
index de5dc83..d3d0616 100644
--- a/tests/FileTest.php
+++ b/tests/FileTest.php
@@ -16,7 +16,11 @@ public function testCanCreateFile()
         $readContent = file_get_contents($fileName);
         $this->assertEquals($content, $readContent);
         unset($tmp);
-        $this->assertFileNotExists($fileName);
+        if (phpUnitVersion('<', '9')) {
+            $this->assertFileNotExists($fileName);
+        } else {
+            $this->assertFileDoesNotExist($fileName);
+        }
     }
 
     public function testCanCreateFileWithSuffix()
@@ -64,7 +68,11 @@ public function testCanSaveFileAs()
         $readContent = file_get_contents($out);
         $this->assertEquals($content, $readContent);
         unset($tmp);
-        $this->assertFileNotExists($fileName);
+        if (phpUnitVersion('<', '9')) {
+            $this->assertFileNotExists($fileName);
+        } else {
+            $this->assertFileDoesNotExist($fileName);
+        }
         $this->assertFileExists($out);
         unlink($out);
     }
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 245a634..a35e967 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -1,9 +1,20 @@
 <?php
-// Some travis environments use phpunit > 6
-$newClass = '\PHPUnit\Framework\TestCase';
-$oldClass = '\PHPUnit_Framework_TestCase';
-if (!class_exists($newClass) && class_exists($oldClass)) {
-    class_alias($oldClass, $newClass);
+
+/**
+ * Utility method to check the version of PHPUnit.
+ *
+ * Example: phpUnitVersion('<', '8.3'); // true e.g. for 8.2.1
+ *
+ * @param string $operator an operator like '>', '<', etc.
+ * @param string $version the version to check against
+ * @return bool whether PHPUnit matches the version to check
+ */
+function phpUnitVersion($operator, $version)
+{
+    $phpUnitVersion = class_exists('\PHPUnit\Runner\Version') ?
+        call_user_func(array('\PHPUnit\Runner\Version', 'id')) :
+        call_user_func(array('\PHPUnit_Runner_Version', 'id'));
+    return version_compare($phpUnitVersion, $version, $operator);
 }
 
 require __DIR__ . '/../vendor/autoload.php';