diff --git a/CHANGELOG.md b/CHANGELOG.md
index fadc51e..ae4926f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 All notable changes to this project will be documented in this file.
 
+## [1.4.0] - 2022-05-05
+Support for Craft 4 added. 
+
 ## [1.3.1] - 2022-05-01
 Previous release wasn't tagged correctly. 
 
diff --git a/README.md b/README.md
index 49c0958..c884979 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ This yii-extension is a memcached drop in replacement for sessions, cache and mu
 
 ## Requirements
 
-* Craft CMS (Version 3)
+* Craft CMS (Version 3 and 4)
 * A Professional App on fortrabbit (see below for other hosting providers)
 
 ## Install
diff --git a/composer.json b/composer.json
index 275e20a..68533a5 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     "docs": "https://github.com/fortrabbit/yii-memcached"
   },
   "require": {
-    "craftcms/cms": "^3.7.30"
+    "craftcms/cms": "^3.7.30|^4.0"
   },
   "autoload": {
     "psr-4": {
@@ -28,5 +28,11 @@
   },
   "extra": {
     "bootstrap": "fortrabbit\\MemcachedEnabler\\Bootstrap"
+  },
+  "config": {
+    "allow-plugins": {
+      "yiisoft/yii2-composer": true,
+      "craftcms/plugin-installer": true
+    }
   }
 }
diff --git a/src/Bootstrap.php b/src/Bootstrap.php
index 98b4400..3fcf327 100644
--- a/src/Bootstrap.php
+++ b/src/Bootstrap.php
@@ -20,6 +20,8 @@ class Bootstrap implements BootstrapInterface
      * Bootstrapper
      *
      * @param \yii\base\Application|\craft\web\Application|\craft\console\Application $app
+     *
+     * @throws \yii\base\InvalidConfigException
      */
     public function bootstrap($app)
     {