diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 33fc105..3c058fa 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -65,4 +65,4 @@ jobs:
           composer-options: --ignore-platform-reqs
 
       - name: PHPUnit tests
-        run: vendor/bin/phpunit
+        run: php -d phar.readonly=0 vendor/bin/phpunit
diff --git a/lib/Release/Bundler/PharBundler.php b/lib/Release/Bundler/PharBundler.php
new file mode 100644
index 0000000..08b30a2
--- /dev/null
+++ b/lib/Release/Bundler/PharBundler.php
@@ -0,0 +1,52 @@
+<?php
+namespace ParagonIE\Gossamer\Release\Bundler;
+
+use ParagonIE\Gossamer\GossamerException;
+use Phar;
+
+class PharBundler extends AbstractBundler
+{
+    /** @var string $defaultStubFilename */
+    protected $defaultStubFilename = 'default-stub.php';
+
+    /**
+     * @param string $filename
+     * @return self
+     */
+    public function setDefaultStubFilename($filename)
+    {
+        $this->assert(is_string($filename), "Argument 1 must be a string");
+        $this->defaultStubFilename = $filename;
+        return $this;
+    }
+
+    /**
+     * @return void
+     * @throws GossamerException
+     */
+    public function throwIfPharReadonly()
+    {
+        $readOnly = (bool) ini_get('phar.readonly');
+        if ($readOnly) {
+            throw new GossamerException(
+                "Cannot work with Phars without setting readonly to false"
+            );
+        }
+    }
+
+    public function bundle($outputFile)
+    {
+        $this->throwIfPharReadonly();
+        $workingDir = \getcwd();
+        \chdir($this->directory);
+
+        $phar = new Phar($outputFile);
+        $phar->startBuffering();
+        $defaultStub = $phar->createDefaultStub($this->defaultStubFilename);
+        $phar->buildFromDirectory($this->directory);
+        $phar->setStub('#!/usr/bin/env php' . "\n" . $defaultStub);
+        $phar->stopBuffering();
+
+        \chdir($workingDir);
+    }
+}
diff --git a/tests/Release/Bundler/PharBundlerTest.php b/tests/Release/Bundler/PharBundlerTest.php
new file mode 100644
index 0000000..dceb0f3
--- /dev/null
+++ b/tests/Release/Bundler/PharBundlerTest.php
@@ -0,0 +1,44 @@
+<?php
+namespace ParagonIE\Gossamer\Tests\Release\Bundler;
+
+use Exception;
+use ParagonIE\Gossamer\Release\Bundler\PharBundler;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers PharBundler
+ */
+class PharBundlerTest extends TestCase
+{
+    /** @var string $dir */
+    protected $dir = '';
+
+    /**
+     * @before
+     */
+    public function before()
+    {
+        $dir = __DIR__;
+        do {
+            $prev = $dir;
+            $dir = realpath(dirname($dir));
+        } while (!empty($dir) && $dir !== $prev && !is_dir($dir . '/.git'));
+        $this->dir = $dir;
+    }
+
+    /**
+     * @throws Exception
+     */
+    public function testPhar()
+    {
+        if (ini_get('phar.readonly')) {
+            $this->markTestSkipped("phar.readonly is set to true");
+        }
+        
+        $bundler = (new PharBundler())
+            ->setWorkDirectory($this->dir . '/lib');
+        $bundler->bundle(dirname($this->dir) . '/test.phar');
+        $this->assertFileExists(dirname($this->dir) . '/test.phar');
+        unlink(dirname($this->dir) . '/test.phar');
+    }
+}