diff --git a/ComposerPlugin.php b/ComposerPlugin.php
index 6e92af9..dc275d3 100644
--- a/ComposerPlugin.php
+++ b/ComposerPlugin.php
@@ -65,4 +65,12 @@ public function onPostAutoloadDump(Event $event) {
       $args;
     $executor->execute($command);
   }
+
+  /** Does nothing but required by Composer 2.0 */
+  public function deactivate(Composer $composer, IOInterface $io) {
+  }
+
+  /** Does nothing but required by Composer 2.0 */
+  public function uninstall(Composer $composer, IOInterface $io) {
+  }
 }
diff --git a/composer.json b/composer.json
index 80e1c3c..49424a2 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
     "bin/hh-autoload.hack"
   ],
   "require": {
-    "composer-plugin-api": "^1.0",
+    "composer-plugin-api": "^1.0|^2.0",
     "hhvm": "^4.25",
     "hhvm/hsl": "^4.0"
   },