diff --git a/src/Pecee/Http/Input/InputFile.php b/src/Pecee/Http/Input/InputFile.php
index 87b65a4..24a38f7 100644
--- a/src/Pecee/Http/Input/InputFile.php
+++ b/src/Pecee/Http/Input/InputFile.php
@@ -9,37 +9,37 @@ class InputFile implements IInputItem
     /**
      * @var string
      */
-    public $index;
+    public string $index;
 
     /**
      * @var string
      */
-    public $name;
+    public string $name;
 
     /**
      * @var string|null
      */
-    public $filename;
+    public ?string $filename = null;
 
     /**
      * @var int|null
      */
-    public $size;
+    public ?int $size = null;
 
     /**
-     * @var int|null
+     * @var string|null
      */
-    public $type;
+    public ?string $type = null;
 
     /**
      * @var int
      */
-    public $errors;
+    public int $errors = 0;
 
     /**
      * @var string|null
      */
-    public $tmpName;
+    public ?string $tmpName = null;
 
     public function __construct(string $index)
     {
@@ -74,7 +74,7 @@ class InputFile implements IInputItem
             'error'    => null,
         ];
 
-        return (new static($values['index']))
+        return (new self($values['index']))
             ->setSize((int)$values['size'])
             ->setError((int)$values['error'])
             ->setType($values['type'])
@@ -104,9 +104,9 @@ class InputFile implements IInputItem
     }
 
     /**
-     * @return string
+     * @return int
      */
-    public function getSize(): string
+    public function getSize(): ?int
     {
         return $this->size;
     }
diff --git a/src/Pecee/Http/Input/InputHandler.php b/src/Pecee/Http/Input/InputHandler.php
index 8cbfae7..943ea04 100644
--- a/src/Pecee/Http/Input/InputHandler.php
+++ b/src/Pecee/Http/Input/InputHandler.php
@@ -10,40 +10,40 @@ class InputHandler
     /**
      * @var array
      */
-    protected $get = [];
+    protected array $get = [];
 
     /**
      * @var array
      */
-    protected $post = [];
+    protected array $post = [];
 
     /**
      * @var array
      */
-    protected $file = [];
+    protected array $file = [];
 
     /**
      * @var Request
      */
-    protected $request;
+    protected Request $request;
 
     /**
      * Original post variables
      * @var array
      */
-    protected $originalPost = [];
+    protected array $originalPost = [];
 
     /**
      * Original get/params variables
      * @var array
      */
-    protected $originalParams = [];
+    protected array $originalParams = [];
 
     /**
      * Get original file variables
      * @var array
      */
-    protected $originalFile = [];
+    protected array $originalFile = [];
 
     /**
      * Input constructor.
diff --git a/src/Pecee/Http/Input/InputItem.php b/src/Pecee/Http/Input/InputItem.php
index 89825b5..c1668c6 100644
--- a/src/Pecee/Http/Input/InputItem.php
+++ b/src/Pecee/Http/Input/InputItem.php
@@ -8,10 +8,18 @@ use IteratorAggregate;
 
 class InputItem implements ArrayAccess, IInputItem, IteratorAggregate
 {
-    public $index;
-    public $name;
+    public string $index;
+    public string $name;
+
+    /**
+     * @var mixed|null
+     */
     public $value;
 
+    /**
+     * @param string $index
+     * @param mixed $value
+     */
     public function __construct(string $index, $value = null)
     {
         $this->index = $index;
diff --git a/src/Pecee/Http/Middleware/BaseCsrfVerifier.php b/src/Pecee/Http/Middleware/BaseCsrfVerifier.php
index 234da3a..454c6cd 100644
--- a/src/Pecee/Http/Middleware/BaseCsrfVerifier.php
+++ b/src/Pecee/Http/Middleware/BaseCsrfVerifier.php
@@ -17,18 +17,18 @@ class BaseCsrfVerifier implements IMiddleware
      * For example: /admin/*
      * @var array|null
      */
-    protected $except;
+    protected ?array $except = null;
 
     /**
      * Urls to include. Can be used to include urls from a certain path.
      * @var array|null
      */
-    protected $include;
+    protected ?array $include = null;
 
     /**
      * @var ITokenProvider
      */
-    protected $tokenProvider;
+    protected ITokenProvider $tokenProvider;
 
     /**
      * BaseCsrfVerifier constructor.
diff --git a/src/Pecee/Http/Middleware/IpRestrictAccess.php b/src/Pecee/Http/Middleware/IpRestrictAccess.php
index 23fdc35..475880c 100644
--- a/src/Pecee/Http/Middleware/IpRestrictAccess.php
+++ b/src/Pecee/Http/Middleware/IpRestrictAccess.php
@@ -7,8 +7,8 @@ use Pecee\SimpleRouter\Exceptions\HttpException;
 
 abstract class IpRestrictAccess implements IMiddleware
 {
-    protected $ipBlacklist = [];
-    protected $ipWhitelist = [];
+    protected array $ipBlacklist = [];
+    protected array $ipWhitelist = [];
 
     protected function validate(string $ip): bool
     {
diff --git a/src/Pecee/Http/Request.php b/src/Pecee/Http/Request.php
index 576264c..e00dee4 100644
--- a/src/Pecee/Http/Request.php
+++ b/src/Pecee/Http/Request.php
@@ -29,7 +29,7 @@ class Request
      * All request-types
      * @var string[]
      */
-    public static $requestTypes = [
+    public static array $requestTypes = [
         self::REQUEST_TYPE_GET,
         self::REQUEST_TYPE_POST,
         self::REQUEST_TYPE_PUT,
@@ -43,7 +43,7 @@ class Request
      * Post request-types.
      * @var string[]
      */
-    public static $requestTypesPost = [
+    public static array $requestTypesPost = [
         self::REQUEST_TYPE_POST,
         self::REQUEST_TYPE_PUT,
         self::REQUEST_TYPE_PATCH,
@@ -55,65 +55,65 @@ class Request
      *
      * @var array
      */
-    private $data = [];
+    private array $data = [];
 
     /**
      * Server headers
      * @var array
      */
-    protected $headers = [];
+    protected array $headers = [];
 
     /**
      * Request ContentType
      * @var string
      */
-    protected $contentType;
+    protected string $contentType;
 
     /**
      * Request host
-     * @var string
+     * @var string|null
      */
-    protected $host;
+    protected ?string $host;
 
     /**
      * Current request url
      * @var Url
      */
-    protected $url;
+    protected Url $url;
 
     /**
      * Request method
      * @var string
      */
-    protected $method;
+    protected string $method;
 
     /**
      * Input handler
      * @var InputHandler
      */
-    protected $inputHandler;
+    protected InputHandler $inputHandler;
 
     /**
      * Defines if request has pending rewrite
      * @var bool
      */
-    protected $hasPendingRewrite = false;
+    protected bool $hasPendingRewrite = false;
 
     /**
      * @var ILoadableRoute|null
      */
-    protected $rewriteRoute;
+    protected ?ILoadableRoute $rewriteRoute = null;
 
     /**
      * Rewrite url
      * @var string|null
      */
-    protected $rewriteUrl;
+    protected ?string $rewriteUrl = null;
 
     /**
      * @var array
      */
-    protected $loadedRoutes = [];
+    protected array $loadedRoutes = [];
 
     /**
      * Request constructor.
@@ -224,15 +224,17 @@ class Request
      */
     public function getIp(bool $safeMode = false): ?string
     {
-        $headers = ['remote-addr'];
+        $headers = [];
         if($safeMode === false) {
-            $headers = array_merge($headers, [
+            $headers = [
                 'http-cf-connecting-ip',
                 'http-client-ip',
                 'http-x-forwarded-for',
-            ]);
+            ];
         }
 
+        $headers[] = 'remote-addr';
+
         return $this->getFirstHeader($headers);
     }
 
diff --git a/src/Pecee/Http/Response.php b/src/Pecee/Http/Response.php
index e4f15d1..0c4b910 100644
--- a/src/Pecee/Http/Response.php
+++ b/src/Pecee/Http/Response.php
@@ -7,7 +7,7 @@ use Pecee\Exceptions\InvalidArgumentException;
 
 class Response
 {
-    protected $request;
+    protected Request $request;
 
     public function __construct(Request $request)
     {
@@ -39,9 +39,6 @@ class Response
             $this->httpCode($httpCode);
         }
 
-        // Gracefully end session (avoid any changes being lost)
-        session_write_close();
-
         $this->header('location: ' . $url);
         exit(0);
     }
@@ -68,7 +65,6 @@ class Response
 
     public function cache(string $eTag, int $lastModifiedTime = 2592000): self
     {
-
         $this->headers([
             'Cache-Control: public',
             sprintf('Last-Modified: %s GMT', gmdate('D, d M Y H:i:s', $lastModifiedTime)),
diff --git a/src/Pecee/Http/Security/CookieTokenProvider.php b/src/Pecee/Http/Security/CookieTokenProvider.php
index 5817242..b748953 100644
--- a/src/Pecee/Http/Security/CookieTokenProvider.php
+++ b/src/Pecee/Http/Security/CookieTokenProvider.php
@@ -12,12 +12,12 @@ class CookieTokenProvider implements ITokenProvider
     /**
      * @var string
      */
-    protected $token;
+    protected ?string $token = null;
 
     /**
      * @var int
      */
-    protected $cookieTimeoutMinutes = 120;
+    protected int $cookieTimeoutMinutes = 120;
 
     /**
      * CookieTokenProvider constructor.
diff --git a/src/Pecee/Http/Url.php b/src/Pecee/Http/Url.php
index 1ff5604..08792fe 100644
--- a/src/Pecee/Http/Url.php
+++ b/src/Pecee/Http/Url.php
@@ -10,53 +10,53 @@ class Url implements JsonSerializable
     /**
      * @var string|null
      */
-    private $originalUrl;
+    private ?string $originalUrl = null;
 
     /**
      * @var string|null
      */
-    private $scheme;
+    private ?string $scheme = null;
 
     /**
      * @var string|null
      */
-    private $host;
+    private ?string $host = null;
 
     /**
      * @var int|null
      */
-    private $port;
+    private ?int $port = null;
 
     /**
      * @var string|null
      */
-    private $username;
+    private ?string $username = null;
 
     /**
      * @var string|null
      */
-    private $password;
+    private ?string $password = null;
 
     /**
      * @var string|null
      */
-    private $path;
+    private ?string $path = null;
 
     /**
      * Original path with no sanitization to ending slash
      * @var string|null
      */
-    private $originalPath;
+    private ?string $originalPath = null;
 
     /**
      * @var array
      */
-    private $params = [];
+    private array $params = [];
 
     /**
      * @var string|null
      */
-    private $fragment;
+    private ?string $fragment = null;
 
     /**
      * Url constructor.
diff --git a/src/Pecee/SimpleRouter/ClassLoader/ClassLoader.php b/src/Pecee/SimpleRouter/ClassLoader/ClassLoader.php
index cb70e69..77c9978 100644
--- a/src/Pecee/SimpleRouter/ClassLoader/ClassLoader.php
+++ b/src/Pecee/SimpleRouter/ClassLoader/ClassLoader.php
@@ -27,7 +27,7 @@ class ClassLoader implements IClassLoader
      * @param object $class
      * @param string $method
      * @param array $parameters
-     * @return object
+     * @return mixed
      */
     public function loadClassMethod($class, string $method, array $parameters)
     {
diff --git a/src/Pecee/SimpleRouter/ClassLoader/IClassLoader.php b/src/Pecee/SimpleRouter/ClassLoader/IClassLoader.php
index 2ac88bd..e8c6050 100644
--- a/src/Pecee/SimpleRouter/ClassLoader/IClassLoader.php
+++ b/src/Pecee/SimpleRouter/ClassLoader/IClassLoader.php
@@ -17,7 +17,7 @@ interface IClassLoader
      * @param object $class
      * @param string $method
      * @param array $parameters
-     * @return object
+     * @return mixed
      */
     public function loadClassMethod($class, string $method, array $parameters);
 
diff --git a/src/Pecee/SimpleRouter/Event/EventArgument.php b/src/Pecee/SimpleRouter/Event/EventArgument.php
index 6921560..2638c78 100644
--- a/src/Pecee/SimpleRouter/Event/EventArgument.php
+++ b/src/Pecee/SimpleRouter/Event/EventArgument.php
@@ -12,17 +12,17 @@ class EventArgument implements IEventArgument
      * Event name
      * @var string
      */
-    protected $eventName;
+    protected string $eventName;
 
     /**
      * @var Router
      */
-    protected $router;
+    protected Router $router;
 
     /**
      * @var array
      */
-    protected $arguments = [];
+    protected array $arguments = [];
 
     public function __construct(string $eventName, Router $router, array $arguments = [])
     {
diff --git a/src/Pecee/SimpleRouter/Exceptions/ClassNotFoundHttpException.php b/src/Pecee/SimpleRouter/Exceptions/ClassNotFoundHttpException.php
index f857f42..dd844f3 100644
--- a/src/Pecee/SimpleRouter/Exceptions/ClassNotFoundHttpException.php
+++ b/src/Pecee/SimpleRouter/Exceptions/ClassNotFoundHttpException.php
@@ -9,12 +9,12 @@ class ClassNotFoundHttpException extends NotFoundHttpException
     /**
      * @var string
      */
-    protected $class;
+    protected string $class;
 
     /**
      * @var string|null
      */
-    protected $method;
+    protected ?string $method = null;
 
     public function __construct(string $class, ?string $method = null, string $message = "", int $code = 0, Throwable $previous = null)
     {
diff --git a/src/Pecee/SimpleRouter/Handlers/CallbackExceptionHandler.php b/src/Pecee/SimpleRouter/Handlers/CallbackExceptionHandler.php
index db39e52..7397d22 100644
--- a/src/Pecee/SimpleRouter/Handlers/CallbackExceptionHandler.php
+++ b/src/Pecee/SimpleRouter/Handlers/CallbackExceptionHandler.php
@@ -20,7 +20,7 @@ class CallbackExceptionHandler implements IExceptionHandler
     /**
      * @var Closure
      */
-    protected $callback;
+    protected Closure $callback;
 
     public function __construct(Closure $callback)
     {
diff --git a/src/Pecee/SimpleRouter/Handlers/DebugEventHandler.php b/src/Pecee/SimpleRouter/Handlers/DebugEventHandler.php
index fd77872..6674fc9 100644
--- a/src/Pecee/SimpleRouter/Handlers/DebugEventHandler.php
+++ b/src/Pecee/SimpleRouter/Handlers/DebugEventHandler.php
@@ -13,7 +13,7 @@ class DebugEventHandler implements IEventHandler
      * Debug callback
      * @var Closure
      */
-    protected $callback;
+    protected Closure $callback;
 
     public function __construct()
     {
diff --git a/src/Pecee/SimpleRouter/Handlers/EventHandler.php b/src/Pecee/SimpleRouter/Handlers/EventHandler.php
index 7bd1f76..3f276b4 100644
--- a/src/Pecee/SimpleRouter/Handlers/EventHandler.php
+++ b/src/Pecee/SimpleRouter/Handlers/EventHandler.php
@@ -97,7 +97,7 @@ class EventHandler implements IEventHandler
      * All available events
      * @var array
      */
-    public static $events = [
+    public static array $events = [
         self::EVENT_ALL,
         self::EVENT_INIT,
         self::EVENT_LOAD,
@@ -120,7 +120,7 @@ class EventHandler implements IEventHandler
      * List of all registered events
      * @var array
      */
-    private $registeredEvents = [];
+    private array $registeredEvents = [];
 
     /**
      * Register new event
diff --git a/src/Pecee/SimpleRouter/Route/LoadableRoute.php b/src/Pecee/SimpleRouter/Route/LoadableRoute.php
index 0996b24..7c93a60 100644
--- a/src/Pecee/SimpleRouter/Route/LoadableRoute.php
+++ b/src/Pecee/SimpleRouter/Route/LoadableRoute.php
@@ -12,17 +12,17 @@ abstract class LoadableRoute extends Route implements ILoadableRoute
     /**
      * @var string
      */
-    protected $url;
+    protected string $url;
 
     /**
      * @var string
      */
-    protected $name;
+    protected ?string $name = null;
 
     /**
      * @var string|null
      */
-    protected $regex;
+    protected ?string $regex = null;
 
     /**
      * Loads and renders middlewares-classes
@@ -195,7 +195,7 @@ abstract class LoadableRoute extends Route implements ILoadableRoute
      */
     public function hasName(string $name): bool
     {
-        return strtolower((string)$this->name) === strtolower((string)$name);
+        return strtolower((string)$this->name) === strtolower($name);
     }
 
     /**
diff --git a/src/Pecee/SimpleRouter/Route/Route.php b/src/Pecee/SimpleRouter/Route/Route.php
index 4afcfc4..3ddf03f 100644
--- a/src/Pecee/SimpleRouter/Route/Route.php
+++ b/src/Pecee/SimpleRouter/Route/Route.php
@@ -18,37 +18,37 @@ abstract class Route implements IRoute
      *
      * @var bool
      */
-    protected $filterEmptyParams = true;
+    protected bool $filterEmptyParams = true;
 
     /**
      * If true the last parameter of the route will include ending trail/slash.
      * @var bool
      */
-    protected $slashParameterEnabled = false;
+    protected bool $slashParameterEnabled = false;
 
     /**
      * Default regular expression used for parsing parameters.
      * @var string|null
      */
-    protected $defaultParameterRegex;
-    protected $paramModifiers = '{}';
-    protected $paramOptionalSymbol = '?';
-    protected $urlRegex = '/^%s\/?$/u';
-    protected $group;
-    protected $parent;
+    protected ?string $defaultParameterRegex = null;
+    protected string $paramModifiers = '{}';
+    protected string $paramOptionalSymbol = '?';
+    protected string $urlRegex = '/^%s\/?$/u';
+    protected ?IGroupRoute $group = null;
+    protected ?IRoute $parent = null;
     /**
      * @var string|callable|null
      */
     protected $callback;
-    protected $defaultNamespace;
+    protected ?string $defaultNamespace = null;
 
     /* Default options */
-    protected $namespace;
-    protected $requestMethods = [];
-    protected $where = [];
-    protected $parameters = [];
-    protected $originalParameters = [];
-    protected $middlewares = [];
+    protected ?string $namespace = null;
+    protected array $requestMethods = [];
+    protected array $where = [];
+    protected array $parameters = [];
+    protected array $originalParameters = [];
+    protected array $middlewares = [];
 
     /**
      * Render route
diff --git a/src/Pecee/SimpleRouter/Route/RouteController.php b/src/Pecee/SimpleRouter/Route/RouteController.php
index c80299e..599126c 100644
--- a/src/Pecee/SimpleRouter/Route/RouteController.php
+++ b/src/Pecee/SimpleRouter/Route/RouteController.php
@@ -6,10 +6,10 @@ use Pecee\Http\Request;
 
 class RouteController extends LoadableRoute implements IControllerRoute
 {
-    protected $defaultMethod = 'index';
-    protected $controller;
-    protected $method;
-    protected $names = [];
+    protected string $defaultMethod = 'index';
+    protected string $controller;
+    protected ?string $method = null;
+    protected array $names = [];
 
     public function __construct($url, $controller)
     {
diff --git a/src/Pecee/SimpleRouter/Route/RouteGroup.php b/src/Pecee/SimpleRouter/Route/RouteGroup.php
index 5089776..53b3512 100644
--- a/src/Pecee/SimpleRouter/Route/RouteGroup.php
+++ b/src/Pecee/SimpleRouter/Route/RouteGroup.php
@@ -7,12 +7,12 @@ use Pecee\SimpleRouter\Handlers\IExceptionHandler;
 
 class RouteGroup extends Route implements IGroupRoute
 {
-    protected $urlRegex = '/^%s\/?/u';
-    protected $prefix;
-    protected $name;
-    protected $domains = [];
-    protected $exceptionHandlers = [];
-    protected $mergeExceptionHandlers = true;
+    protected string $urlRegex = '/^%s\/?/u';
+    protected ?string $prefix = null;
+    protected ?string $name = null;
+    protected array $domains = [];
+    protected array $exceptionHandlers = [];
+    protected bool $mergeExceptionHandlers = true;
 
     /**
      * Method called to check if a domain matches
@@ -22,7 +22,7 @@ class RouteGroup extends Route implements IGroupRoute
      */
     public function matchDomain(Request $request): bool
     {
-        if ($this->domains === null || count($this->domains) === 0) {
+        if (count($this->domains) === 0) {
             return true;
         }
 
diff --git a/src/Pecee/SimpleRouter/Route/RouteResource.php b/src/Pecee/SimpleRouter/Route/RouteResource.php
index 29bf4db..7ec6307 100644
--- a/src/Pecee/SimpleRouter/Route/RouteResource.php
+++ b/src/Pecee/SimpleRouter/Route/RouteResource.php
@@ -6,7 +6,7 @@ use Pecee\Http\Request;
 
 class RouteResource extends LoadableRoute implements IControllerRoute
 {
-    protected $urls = [
+    protected array $urls = [
         'index'   => '',
         'create'  => 'create',
         'store'   => '',
@@ -16,7 +16,7 @@ class RouteResource extends LoadableRoute implements IControllerRoute
         'destroy' => '',
     ];
 
-    protected $methodNames = [
+    protected array $methodNames = [
         'index'   => 'index',
         'create'  => 'create',
         'store'   => 'store',
@@ -26,8 +26,8 @@ class RouteResource extends LoadableRoute implements IControllerRoute
         'destroy' => 'destroy',
     ];
 
-    protected $names = [];
-    protected $controller;
+    protected array $names = [];
+    protected string $controller;
 
     public function __construct($url, $controller)
     {
diff --git a/src/Pecee/SimpleRouter/Router.php b/src/Pecee/SimpleRouter/Router.php
index 0505309..a066b77 100644
--- a/src/Pecee/SimpleRouter/Router.php
+++ b/src/Pecee/SimpleRouter/Router.php
@@ -28,56 +28,56 @@ class Router
      * Current request
      * @var Request
      */
-    protected $request;
+    protected Request $request;
 
     /**
      * Defines if a route is currently being processed.
      * @var bool
      */
-    protected $isProcessingRoute;
+    protected bool $isProcessingRoute;
     
     /**
      * Defines all data from current processing route.
      * @var ILoadableRoute
      */
-    protected $currentProcessingRoute;
+    protected ILoadableRoute $currentProcessingRoute;
 
     /**
      * All added routes
      * @var array
      */
-    protected $routes = [];
+    protected array $routes = [];
 
     /**
      * List of processed routes
      * @var array|ILoadableRoute[]
      */
-    protected $processedRoutes = [];
+    protected array $processedRoutes = [];
 
     /**
      * Stack of routes used to keep track of sub-routes added
      * when a route is being processed.
      * @var array
      */
-    protected $routeStack = [];
+    protected array$routeStack = [];
 
     /**
      * List of added bootmanagers
      * @var array
      */
-    protected $bootManagers = [];
+    protected array $bootManagers = [];
 
     /**
      * Csrf verifier class
      * @var BaseCsrfVerifier|null
      */
-    protected $csrfVerifier;
+    protected ?BaseCsrfVerifier $csrfVerifier;
 
     /**
      * Get exception handlers
      * @var array
      */
-    protected $exceptionHandlers = [];
+    protected array $exceptionHandlers = [];
 
     /**
      * List of loaded exception that has been loaded.
@@ -85,44 +85,44 @@ class Router
      *
      * @var array
      */
-    protected $loadedExceptionHandlers = [];
+    protected array $loadedExceptionHandlers = [];
 
     /**
      * Enable or disabled debugging
      * @var bool
      */
-    protected $debugEnabled = false;
+    protected bool $debugEnabled = false;
 
     /**
      * The start time used when debugging is enabled
      * @var float
      */
-    protected $debugStartTime;
+    protected float $debugStartTime;
 
     /**
      * List containing all debug messages
      * @var array
      */
-    protected $debugList = [];
+    protected array $debugList = [];
 
     /**
      * Contains any registered event-handler.
      * @var array
      */
-    protected $eventHandlers = [];
+    protected array $eventHandlers = [];
 
     /**
      * Class loader instance
      * @var IClassLoader
      */
-    protected $classLoader;
+    protected IClassLoader $classLoader;
 
     /**
      * When enabled the router will render all routes that matches.
      * When disabled the router will stop execution when first route is found.
      * @var bool
      */
-    protected $renderMultipleRoutes = false;
+    protected bool $renderMultipleRoutes = false;
 
     /**
      * Router constructor.
@@ -345,7 +345,7 @@ class Router
             try {
                 /* Verify csrf token for request */
                 $this->csrfVerifier->handle($this->request);
-            } catch(\Exception $e) {
+            } catch(Exception $e) {
                 $this->handleException($e);
             }
         }
diff --git a/src/Pecee/SimpleRouter/SimpleRouter.php b/src/Pecee/SimpleRouter/SimpleRouter.php
index 36aa73f..52622f6 100644
--- a/src/Pecee/SimpleRouter/SimpleRouter.php
+++ b/src/Pecee/SimpleRouter/SimpleRouter.php
@@ -37,19 +37,19 @@ class SimpleRouter
      * Default namespace added to all routes
      * @var string|null
      */
-    protected static $defaultNamespace;
+    protected static ?string $defaultNamespace = null;
 
     /**
      * The response object
      * @var Response
      */
-    protected static $response;
+    protected static Response $response;
 
     /**
      * Router instance
      * @var Router
      */
-    protected static $router;
+    protected static ?Router $router = null;
 
     /**
      * Start routing
@@ -493,7 +493,7 @@ class SimpleRouter
      * Prepends the default namespace to all new routes added.
      *
      * @param ILoadableRoute|IRoute $route
-     * @return IRoute
+     * @return IRoute|ILoadableRoute
      */
     public static function addDefaultNamespace(IRoute $route): IRoute
     {
diff --git a/tests/Pecee/SimpleRouter/Dummy/CsrfVerifier/DummyCsrfVerifier.php b/tests/Pecee/SimpleRouter/Dummy/CsrfVerifier/DummyCsrfVerifier.php
index a695452..4c87c37 100644
--- a/tests/Pecee/SimpleRouter/Dummy/CsrfVerifier/DummyCsrfVerifier.php
+++ b/tests/Pecee/SimpleRouter/Dummy/CsrfVerifier/DummyCsrfVerifier.php
@@ -2,12 +2,12 @@
 
 class DummyCsrfVerifier extends \Pecee\Http\Middleware\BaseCsrfVerifier {
 
-    protected $except = [
+    protected ?array $except = [
         '/exclude-page',
         '/exclude-all/*',
     ];
 
-    protected $include = [
+    protected ?array $include = [
         '/exclude-all/include-page',
     ];
 
diff --git a/tests/Pecee/SimpleRouter/Dummy/Middleware/IpRestrictMiddleware.php b/tests/Pecee/SimpleRouter/Dummy/Middleware/IpRestrictMiddleware.php
index df0d526..3c21e93 100644
--- a/tests/Pecee/SimpleRouter/Dummy/Middleware/IpRestrictMiddleware.php
+++ b/tests/Pecee/SimpleRouter/Dummy/Middleware/IpRestrictMiddleware.php
@@ -2,12 +2,12 @@
 
 class IpRestrictMiddleware extends \Pecee\Http\Middleware\IpRestrictAccess {
 
-    protected $ipBlacklist = [
+    protected array $ipBlacklist = [
         '5.5.5.5',
         '8.8.*',
     ];
 
-    protected $ipWhitelist = [
+    protected array $ipWhitelist = [
         '8.8.2.2',
     ];