diff --git a/composer.json b/composer.json
index e275970..6009102 100644
--- a/composer.json
+++ b/composer.json
@@ -16,11 +16,11 @@
         "files": ["src/autoload.php"]
     },
     "require": {
-        "composer-plugin-api": "^1.1",
+        "composer-plugin-api": "^1.1 || ^2.0",
         "php": "^7.1"
     },
     "require-dev": {
-        "composer/composer": "^1.7",
+        "composer/composer": "^2.0",
         "peridot-php/leo": "^1.6",
         "peridot-php/peridot": "^1.19"
     },
diff --git a/src/PhpIncPlugin.php b/src/PhpIncPlugin.php
index 473fca0..a0511b8 100644
--- a/src/PhpIncPlugin.php
+++ b/src/PhpIncPlugin.php
@@ -20,6 +20,8 @@ class PhpIncPlugin implements PluginInterface, EventSubscriberInterface
      * @param IOInterface $io
      */
     public function activate(Composer $composer, IOInterface $io) {}
+    public function deactivate(Composer $composer, IOInterface $io) {}
+    public function uninstall(Composer $composer, IOInterface $io) {}
 
     /**
      * Returns an array of event names this subscriber wants to listen to.