diff --git a/.wp-env.json b/.wp-env.json
index 2c3c1d6..3997120 100644
--- a/.wp-env.json
+++ b/.wp-env.json
@@ -1,5 +1,5 @@
 {
-  "core": "WordPress/WordPress#6.2",
+  "core": "./vendor/roots/wordpress-no-content",
   "themes": ["./.development/themes/test-theme"],
   "env": {
     "development": {
diff --git a/composer.json b/composer.json
index b11f39a..ba0b5e2 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,8 @@
     "brain/monkey": "^2.6",
     "mikey179/vfsstream": "^2.0",
     "mockery/mockery": "^1.5",
-    "inpsyde/wp-stubs": "dev-main"
+    "php-stubs/wordpress-stubs": "~6.2.0",
+    "roots/wordpress-no-content": "~6.2.0"
   },
   "autoload": {
     "psr-4": {
diff --git a/package.json b/package.json
index c0e7d97..8f393ad 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,5 @@
 {
   "name": "@inpsyde/gutenberg-versions-mirror",
-  "version": "1.0.0",
   "description": "A lib that activate/deactivate a Gutenberg version depending on the Theme being activate",
   "main": "index.js",
   "repository": "git@github.com:inpsyde/gutenberg-versions-manager.git",
@@ -10,6 +9,7 @@
     "@wordpress/env": "^8.10.0"
   },
   "scripts": {
-    "wp-env": "wp-env"
+    "wp-env:start": "wp-env start --environment=development",
+    "wp-env:stop": "wp-env stop"
   }
 }
diff --git a/psalm.xml b/psalm.xml
index 05a8e4c..ad06cf9 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -6,17 +6,23 @@
     strictBinaryOperands="true"
     ignoreInternalFunctionFalseReturn="false"
     ignoreInternalFunctionNullReturn="false"
+    findUnusedCode="true"
+    findUnusedBaselineEntry="true"
     hideExternalErrors="true"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="https://getpsalm.org/schema/config"
     xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
 >
     <projectFiles>
-        <directory name="src" />
+        <directory name="src"/>
+
+        <ignoreFiles>
+            <directory name=".development"/>
+        </ignoreFiles>
     </projectFiles>
 
     <stubs>
-        <file name="vendor/inpsyde/wp-stubs/stubs/latest.php"/>
+        <file name="vendor/php-stubs/wordpress-stubs/wordpress-stubs.php"/>
     </stubs>
 
     <issueHandlers>
diff --git a/src/Provider/ServiceIntegration.php b/src/Provider/ServiceIntegration.php
index 3e24f90..9cdf8bb 100644
--- a/src/Provider/ServiceIntegration.php
+++ b/src/Provider/ServiceIntegration.php
@@ -44,7 +44,7 @@ public function boot(App\Container $c): bool
         // phpcs:disable Inpsyde.CodeQuality.LineLength.TooLong
         if ($this->isGutenbergPluginActive()) {
             $this->notice->addNotice(
-                \__(
+                __(
                     'Gutenberg Version Manager cannot activate the Gutenberg plugin because a version of it is currently active. Please disable the Gutenberg plugin first.',
                     'gutenberg-versions-manager'
                 ),
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 073aa88..1aa1018 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -1,17 +1,9 @@
-<?php // phpcs:disable
+<?php
+
 declare(strict_types=1);
 
-(static function (string $libPath): void {
-    $vendorDir = "{$libPath}/vendor";
-    $phpTestDir = __DIR__;
-    $testsDir = \dirname($phpTestDir);
+namespace Inpsyde\GutenbergVersionManager\Tests;
 
-    if (!\realpath($vendorDir)) {
-        die('Please install via Composer before running tests.');
-    }
+require_once __DIR__ . '/functions.php';
 
-    /** @noinspection PhpIncludeInspection */
-    require_once "{$vendorDir}/autoload.php";
-})(
-    \dirname(__DIR__)
-);
+bootstrap(\dirname(__DIR__));
diff --git a/tests/functions.php b/tests/functions.php
new file mode 100644
index 0000000..02f53cb
--- /dev/null
+++ b/tests/functions.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Inpsyde\GutenbergVersionManager\Tests;
+
+function bootstrap(string $libPath): void
+{
+    $vendorDir = "{$libPath}/vendor";
+    $phpTestDir = __DIR__;
+    $testsDir = \dirname($phpTestDir);
+
+    if (!\realpath($vendorDir)) {
+        die('Please install via Composer before running tests.');
+    }
+
+    require_once "{$vendorDir}/autoload.php";
+}
diff --git a/tests/src/UnitTestCase.php b/tests/src/UnitTestCase.php
index 5043121..e82a7f2 100644
--- a/tests/src/UnitTestCase.php
+++ b/tests/src/UnitTestCase.php
@@ -47,6 +47,7 @@ class UnitTestCase extends TestCase
                     'gutenberg.php' => '',
                 ],
             ],
+            'theme-without-config-directory' => [],
         ],
     ];
 
diff --git a/tests/unit/Service/SupportedVersionsTest.php b/tests/unit/Service/SupportedVersionsTest.php
index 7a591c6..ac29362 100644
--- a/tests/unit/Service/SupportedVersionsTest.php
+++ b/tests/unit/Service/SupportedVersionsTest.php
@@ -55,9 +55,9 @@ public function retrieve_empty_versions(): void
     }
 
     /**
-     * @test The `versions` entry does not exist and empty `versions` is returned
+     * @test Empty file content will still return an empty `versions` entry
      */
-    public function return_empty_versions_entry_if_entry_does_not_exists(): void
+    public function return_empty_versions_entry_if_file_content_is_empty(): void
     {
         $this->theme
             ->shouldReceive('get_template_directory')
@@ -70,13 +70,13 @@ public function return_empty_versions_entry_if_entry_does_not_exists(): void
     }
 
     /**
-     * @test Empty file content will still return an empty `versions` entry
+     * @test The config directory does not exists
      */
-    public function return_empty_versions_entry_if_file_content_is_empty(): void
+    public function return_empty_versions_entry_if_config_directory_does_not_exists(): void
     {
         $this->theme
             ->shouldReceive('get_template_directory')
-            ->andReturn($this->themesPath('not-exists-versions-theme-name'));
+            ->andReturn($this->themesPath('theme-without-config-directory'));
 
         $supportedThemeVersions = Service\SupportedVersions::new();
         $versions = $supportedThemeVersions->forTheme($this->theme);