diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
new file mode 100644
index 0000000..7072300
--- /dev/null
+++ b/.github/workflows/php.yml
@@ -0,0 +1,27 @@
+on: push
+
+name: GitHub Action
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions: ['5.6', '7.0', '7.1', '7.2', '7.3', '7.4' ]
+        phpunit-versions: ['latest']
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php-versions }}
+        tools: composer
+       
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress
+
+    - name: phpunit
+      run: composer test
+      
diff --git a/composer.json b/composer.json
index fdf7d7c..1b86c8d 100644
--- a/composer.json
+++ b/composer.json
@@ -22,6 +22,9 @@
         "php": ">=5.3.0",
         "ext-xmlwriter": "*"
     },
+    "scripts": {
+       "test" : "@php vendor/bin/phpunit tests"  
+    },
     "require-dev": {
         "phpunit/phpunit": "~4.4"
     },
diff --git a/tests/IndexTest.php b/tests/IndexTest.php
index eafb7b9..2d180b0 100644
--- a/tests/IndexTest.php
+++ b/tests/IndexTest.php
@@ -47,7 +47,7 @@ public function testWritingFileGzipped()
 
         $this->assertTrue(file_exists($fileName));
         $finfo = new \finfo(FILEINFO_MIME_TYPE);
-        $this->assertEquals('application/x-gzip', $finfo->file($fileName));
+        $this->assertRegExp('!application/(x-)?gzip!', $finfo->file($fileName));
         $this->assertIsValidIndex('compress.zlib://' . $fileName);
         unlink($fileName);
     }
diff --git a/tests/SitemapTest.php b/tests/SitemapTest.php
index c1c4a14..28e1c51 100644
--- a/tests/SitemapTest.php
+++ b/tests/SitemapTest.php
@@ -197,7 +197,7 @@ public function testWritingFileGzipped()
 
         $this->assertTrue(file_exists($fileName));
         $finfo = new \finfo(FILEINFO_MIME_TYPE);
-        $this->assertEquals('application/x-gzip', $finfo->file($fileName));
+        $this->assertRegExp('!application/(x-)?gzip!', $finfo->file($fileName));
         $this->assertIsValidSitemap('compress.zlib://' . $fileName);
         $this->assertIsOneMemberGzipFile($fileName);
 
@@ -230,7 +230,7 @@ public function testMultipleFilesGzipped()
         $finfo = new \finfo(FILEINFO_MIME_TYPE);
         foreach ($expectedFiles as $expectedFile) {
             $this->assertTrue(file_exists($expectedFile), "$expectedFile does not exist!");
-            $this->assertEquals('application/x-gzip', $finfo->file($expectedFile));
+            $this->assertRegExp('!application/(x-)?gzip!', $finfo->file($expectedFile));
             $this->assertIsValidSitemap('compress.zlib://' . $expectedFile);
             $this->assertIsOneMemberGzipFile($expectedFile);
             unlink($expectedFile);