diff --git a/composer.json b/composer.json
index 273460b..01f0c2f 100644
--- a/composer.json
+++ b/composer.json
@@ -13,10 +13,10 @@
     "require": {
         "php": "^5.3.2 || ^7.0",
         "ext-curl": "*",
-        "composer-plugin-api": "^1.0.0"
+        "composer-plugin-api": "^1.0.0 || ^2.0.0"
     },
     "require-dev": {
-        "composer/composer": "1.0.0",
+        "composer/composer": "1.0.0 || ^2.0.0",
         "phpunit/phpunit": "4.8.* || 5.7.* || ^6.3",
         "squizlabs/php_codesniffer": "^2.5"
     },
diff --git a/src/Plugin.php b/src/Plugin.php
index 0a42cd0..1f21db8 100644
--- a/src/Plugin.php
+++ b/src/Plugin.php
@@ -51,6 +51,11 @@ class Plugin implements
 
     public function activate(Composer $composer, IO\IOInterface $io)
     {
+        // Composer 2 comes with parallel downloads built-in
+        if (strcmp(self::PLUGIN_API_VERSION, '2.0.0') >= 0) {
+            return $this->disable();
+        }
+
         // @codeCoverageIgnoreStart
         // guard for self-update problem
         if (__CLASS__ !== 'Hirak\Prestissimo\Plugin') {
@@ -95,6 +100,16 @@ class_exists(__NAMESPACE__ . '\\' . $class);
         }
     }
 
+    public function deactivate(Composer $composer, IO\IOInterface $io)
+    {
+        $this->disable();
+    }
+
+    public function uninstall(Composer $composer, IO\IOInterface $io)
+    {
+        $this->disable();
+    }
+
     public static function getSubscribedEvents()
     {
         return array(
diff --git a/tests/unit/PluginTest.php b/tests/unit/PluginTest.php
index 90a65cb..1d46ea7 100644
--- a/tests/unit/PluginTest.php
+++ b/tests/unit/PluginTest.php
@@ -62,6 +62,22 @@ public function testActivate()
         self::assertTrue(class_exists('Hirak\Prestissimo\CopyRequest', false));
     }
 
+    public function testDeactivate()
+    {
+        $plugin = new Plugin;
+        self::assertFalse($plugin->isDisabled());
+        $plugin->deactivate($this->composerp->reveal(), $this->iop->reveal());
+        self::assertTrue($plugin->isDisabled());
+    }
+
+    public function testUninstall()
+    {
+        $plugin = new Plugin;
+        self::assertFalse($plugin->isDisabled());
+        $plugin->uninstall($this->composerp->reveal(), $this->iop->reveal());
+        self::assertTrue($plugin->isDisabled());
+    }
+
     public function testGetSubscribedEvent()
     {
         self::assertInternalType('array', Plugin::getSubscribedEvents());