diff --git a/codeception.dist.yml b/codeception.dist.yml
index 82b9cc8e..57db72b8 100644
--- a/codeception.dist.yml
+++ b/codeception.dist.yml
@@ -23,10 +23,13 @@ extensions:
                 src: "%WP_ROOT_FOLDER%/wp-content/plugins/publishpress-authors/src"
                 vendor: "%WP_ROOT_FOLDER%/wp-content/plugins/publishpress-authors/vendor"
                 publishpress-authors.php: "%WP_ROOT_FOLDER%/wp-content/plugins/publishpress-authors/publishpress-authors.php"
+                includes.php: "%WP_ROOT_FOLDER%/wp-content/plugins/publishpress-authors/includes.php"
+                deprecated.php: "%WP_ROOT_FOLDER%/wp-content/plugins/publishpress-authors/deprecated.php"
+                defines.php: "%WP_ROOT_FOLDER%/wp-content/plugins/publishpress-authors/defines.php"
 
 params:
     - .env.testing
 settings:
     shuffle: true
     lint: true
-    report_useless_tests: true
\ No newline at end of file
+    report_useless_tests: true
diff --git a/composer.lock b/composer.lock
index 30893cf8..bf4f8391 100644
--- a/composer.lock
+++ b/composer.lock
@@ -3287,16 +3287,16 @@
         },
         {
             "name": "phpmd/phpmd",
-            "version": "2.8.2",
+            "version": "2.9.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpmd/phpmd.git",
-                "reference": "714629ed782537f638fe23c4346637659b779a77"
+                "reference": "2a346575a45a6f00e631f4d7f3f71b6a05e0d46d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpmd/phpmd/zipball/714629ed782537f638fe23c4346637659b779a77",
-                "reference": "714629ed782537f638fe23c4346637659b779a77",
+                "url": "https://api.github.com/repos/phpmd/phpmd/zipball/2a346575a45a6f00e631f4d7f3f71b6a05e0d46d",
+                "reference": "2a346575a45a6f00e631f4d7f3f71b6a05e0d46d",
                 "shasum": ""
             },
             "require": {
@@ -3307,6 +3307,8 @@
             },
             "require-dev": {
                 "easy-doc/easy-doc": "0.0.0 || ^1.3.2",
+                "ext-json": "*",
+                "ext-simplexml": "*",
                 "gregwar/rst": "^1.0",
                 "mikey179/vfsstream": "^1.6.4",
                 "phpunit/phpunit": "^4.8.36 || ^5.7.27",
@@ -3353,7 +3355,7 @@
                 "phpmd",
                 "pmd"
             ],
-            "time": "2020-02-16T20:15:50+00:00"
+            "time": "2020-09-02T09:12:27+00:00"
         },
         {
             "name": "phpspec/prophecy",
@@ -5183,7 +5185,7 @@
         },
         {
             "name": "symfony/browser-kit",
-            "version": "v5.1.4",
+            "version": "v5.1.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/browser-kit.git",
@@ -5242,7 +5244,7 @@
         },
         {
             "name": "symfony/config",
-            "version": "v5.1.4",
+            "version": "v5.1.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/config.git",
@@ -5308,16 +5310,16 @@
         },
         {
             "name": "symfony/console",
-            "version": "v5.1.4",
+            "version": "v5.1.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "51ff337ce194bdc3d8db12b20ce8cd54ac9f71e9"
+                "reference": "186f395b256065ba9b890c0a4e48a91d598fa2cf"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/51ff337ce194bdc3d8db12b20ce8cd54ac9f71e9",
-                "reference": "51ff337ce194bdc3d8db12b20ce8cd54ac9f71e9",
+                "url": "https://api.github.com/repos/symfony/console/zipball/186f395b256065ba9b890c0a4e48a91d598fa2cf",
+                "reference": "186f395b256065ba9b890c0a4e48a91d598fa2cf",
                 "shasum": ""
             },
             "require": {
@@ -5383,11 +5385,11 @@
             ],
             "description": "Symfony Console Component",
             "homepage": "https://symfony.com",
-            "time": "2020-08-17T13:51:41+00:00"
+            "time": "2020-09-02T07:07:40+00:00"
         },
         {
             "name": "symfony/css-selector",
-            "version": "v5.1.4",
+            "version": "v5.1.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/css-selector.git",
@@ -5440,16 +5442,16 @@
         },
         {
             "name": "symfony/dependency-injection",
-            "version": "v5.1.4",
+            "version": "v5.1.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/dependency-injection.git",
-                "reference": "52e8a8a63f9e6ba56e83be076fd48cc309191e10"
+                "reference": "48d6890e12ce9cd8e68aaa4fb72010139312fd73"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/dependency-injection/zipball/52e8a8a63f9e6ba56e83be076fd48cc309191e10",
-                "reference": "52e8a8a63f9e6ba56e83be076fd48cc309191e10",
+                "url": "https://api.github.com/repos/symfony/dependency-injection/zipball/48d6890e12ce9cd8e68aaa4fb72010139312fd73",
+                "reference": "48d6890e12ce9cd8e68aaa4fb72010139312fd73",
                 "shasum": ""
             },
             "require": {
@@ -5511,7 +5513,7 @@
             ],
             "description": "Symfony DependencyInjection Component",
             "homepage": "https://symfony.com",
-            "time": "2020-08-26T09:10:33+00:00"
+            "time": "2020-09-01T18:07:16+00:00"
         },
         {
             "name": "symfony/deprecation-contracts",
@@ -5565,7 +5567,7 @@
         },
         {
             "name": "symfony/dom-crawler",
-            "version": "v5.1.4",
+            "version": "v5.1.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/dom-crawler.git",
@@ -5627,7 +5629,7 @@
         },
         {
             "name": "symfony/event-dispatcher",
-            "version": "v5.1.4",
+            "version": "v5.1.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/event-dispatcher.git",
@@ -5761,7 +5763,7 @@
         },
         {
             "name": "symfony/filesystem",
-            "version": "v4.4.12",
+            "version": "v4.4.13",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/filesystem.git",
@@ -5811,7 +5813,7 @@
         },
         {
             "name": "symfony/finder",
-            "version": "v5.1.4",
+            "version": "v5.1.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/finder.git",
@@ -6182,7 +6184,7 @@
         },
         {
             "name": "symfony/process",
-            "version": "v4.4.12",
+            "version": "v4.4.13",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
@@ -6293,7 +6295,7 @@
         },
         {
             "name": "symfony/string",
-            "version": "v5.1.4",
+            "version": "v5.1.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/string.git",
@@ -6364,7 +6366,7 @@
         },
         {
             "name": "symfony/translation",
-            "version": "v5.1.4",
+            "version": "v5.1.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/translation.git",
@@ -6503,7 +6505,7 @@
         },
         {
             "name": "symfony/yaml",
-            "version": "v4.4.12",
+            "version": "v4.4.13",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
diff --git a/defines.php b/defines.php
index 49072995..5cdcdda3 100644
--- a/defines.php
+++ b/defines.php
@@ -12,7 +12,7 @@
 defined('ABSPATH') or die('No direct script access allowed.');
 
 if (!defined('PP_AUTHORS_VERSION')) {
-    define('PP_AUTHORS_VERSION', '3.6.0');
+    define('PP_AUTHORS_VERSION', '3.6.1');
     define('PP_AUTHORS_FILE', 'publishpress-authors/publishpress-authors.php');
     define('PP_AUTHORS_BASE_PATH', plugin_dir_path(__DIR__ . '/publishpress-authors.php'));
     define('PP_AUTHORS_MODULES_PATH', PP_AUTHORS_BASE_PATH . 'src/modules/');
diff --git a/publishpress-authors.php b/publishpress-authors.php
index f9e2ef87..19d85125 100644
--- a/publishpress-authors.php
+++ b/publishpress-authors.php
@@ -5,7 +5,7 @@
  * Description: PublishPress Authors allows you to add multiple authors and guest authors to WordPress posts
  * Author:      PublishPress
  * Author URI:  https://publishpress.com
- * Version: 3.6.0
+ * Version: 3.6.1
  * Text Domain: publishpress-authors
  *
  * ------------------------------------------------------------------------------
diff --git a/readme.txt b/readme.txt
index 7d261809..9cf6fdce 100644
--- a/readme.txt
+++ b/readme.txt
@@ -127,6 +127,10 @@ There are two ways to install the PublishPress Authors plugin:
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning v2.0.0](https://semver.org/spec/v2.0.0.html).
 
+= [3.6.1] - 2020-09-03 =
+
+* Fixed: Fix admin notice for Co-Authors Plus displaying even when the plugin is not installed;
+
 = [3.6.0] - 2020-09-02 =
 
 * Added: Added support to update authors for posts using the quick edit form, #180;
diff --git a/src/modules/multiple-authors/multiple-authors.php b/src/modules/multiple-authors/multiple-authors.php
index 695ad71c..0c1dccd4 100644
--- a/src/modules/multiple-authors/multiple-authors.php
+++ b/src/modules/multiple-authors/multiple-authors.php
@@ -1926,6 +1926,10 @@ public function coauthorsMigrationNotice()
         {
             global $pagenow;
 
+            if (!isset($GLOBALS['coauthors_plus']) || empty($GLOBALS['coauthors_plus'])) {
+                return;
+            }
+
             $requirements = [
                 (isset($_GET['page']) && $_GET['page'] === 'ppma-modules-settings') ? 1 : 0,
                 ($pagenow === 'edit-tags.php' && isset($_GET['taxonomy']) && $_GET['taxonomy'] === 'author') ? 1 : 0