diff --git a/phpstan.neon b/phpstan.neon
index f5ef75b2f..1782b81bb 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -41,10 +41,7 @@ parameters:
 		- "#PHPDoc tag @param references unknown parameter#"
 
 	scanFiles:
-		- %rootDir%/../../php-stubs/wordpress-stubs/wordpress-stubs.php
 		- %rootDir%/../../php-stubs/wp-cli-stubs/wp-cli-stubs.php
-		- %rootDir%/../../php-stubs/wp-cli-stubs/wp-cli-commands-stubs.php
-		- %rootDir%/../../php-stubs/wp-cli-stubs/wp-cli-i18n-stubs.php
 
 #    excludePaths:
 #        - ./*/*/FileToBeExcluded.php
diff --git a/src/mantle/framework/class-alias-loader.php b/src/mantle/framework/class-alias-loader.php
index bbe5da17f..94d2ed654 100644
--- a/src/mantle/framework/class-alias-loader.php
+++ b/src/mantle/framework/class-alias-loader.php
@@ -66,14 +66,12 @@ public static function get_instance( array $aliases = [] ): Alias_Loader {
 	 * Load a class alias if it is registered.
 	 *
 	 * @param  string $alias Alias to load.
-	 * @return bool|null
+	 * @return void
 	 */
-	public function load( $alias ) {
+	public function load( $alias ): void {
 		if ( isset( $this->aliases[ $alias ] ) ) {
-			return class_alias( $this->aliases[ $alias ], $alias );
+			class_alias( $this->aliases[ $alias ], $alias );
 		}
-
-		return null;
 	}
 
 	/**
@@ -105,7 +103,7 @@ public function register() {
 	 * @return void
 	 */
 	protected function prepend_to_loader_stack() {
-		spl_autoload_register( [ $this, 'load' ], true, true ); // @phpstan-ignore-line Parameter #1 $callback of function spl_autoload_register
+		spl_autoload_register( [ $this, 'load' ], true, true );
 	}
 
 	/**
diff --git a/src/mantle/framework/manifest/class-model-manifest.php b/src/mantle/framework/manifest/class-model-manifest.php
index c3981b846..6f5a83f84 100644
--- a/src/mantle/framework/manifest/class-model-manifest.php
+++ b/src/mantle/framework/manifest/class-model-manifest.php
@@ -26,28 +26,28 @@ class Model_Manifest {
 	 *
 	 * @var array|null
 	 */
-	protected $manifest;
+	protected ?array $manifest = null;
 
 	/**
 	 * Base folder path.
 	 *
 	 * @var string
 	 */
-	protected $base_path;
+	protected string $base_path;
 
 	/**
 	 * Vendor folder path.
 	 *
 	 * @var string
 	 */
-	protected $vendor_path;
+	protected string $vendor_path;
 
 	/**
 	 * Package Manifest file path.
 	 *
 	 * @var string
 	 */
-	protected $manifest_path;
+	protected string $manifest_path;
 
 	/**
 	 * Constructor.
diff --git a/src/mantle/http-client/class-response.php b/src/mantle/http-client/class-response.php
index cf8a54dfb..d44de517a 100644
--- a/src/mantle/http-client/class-response.php
+++ b/src/mantle/http-client/class-response.php
@@ -351,7 +351,7 @@ public function cookies(): array {
 	 * Retrieve a specific cookie by name.
 	 *
 	 * @param string $name Cookie name.
-	 * @return WP_Http_Cookie
+	 * @return WP_Http_Cookie|null
 	 */
 	public function cookie( string $name ): ?WP_Http_Cookie {
 		return collect( $this->cookies() )