diff --git a/activitypub.php b/activitypub.php
index f8633e8..7320f0c 100644
--- a/activitypub.php
+++ b/activitypub.php
@@ -15,8 +15,6 @@
 
 namespace Activitypub;
 
-require __DIR__ . '/vendor/autoload.php';
-
 /**
  * Initialize plugin
  */
diff --git a/composer.json b/composer.json
index e9cb057..67bd2d3 100644
--- a/composer.json
+++ b/composer.json
@@ -4,8 +4,7 @@
     "type": "wordpress-plugin",
     "require": {
         "php": ">=5.6.0",
-        "composer/installers": "^1.0 || ^2.0",
-        "phpseclib/phpseclib": "~3.0"
+        "composer/installers": "^1.0 || ^2.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.7.21 || ^6.5 || ^7.5 || ^8",