diff --git a/helpers/helpers.php b/helpers/helpers.php
index 488f87c..bae1414 100644
--- a/helpers/helpers.php
+++ b/helpers/helpers.php
@@ -30,7 +30,7 @@ function page_title(string $title, bool $withAppName = true, string $separator =
     /**
      * Set theme.
      */
-    function theme(?string $themeName = null): Hexadog\ThemesManager\Theme
+    function theme(string $themeName = null): Hexadog\ThemesManager\Theme
     {
         if ($themeName) {
             \Theme::set($themeName);
diff --git a/src/Exceptions/ThemeLoaderException.php b/src/Exceptions/ThemeLoaderException.php
index b9f0e5c..75f2bef 100644
--- a/src/Exceptions/ThemeLoaderException.php
+++ b/src/Exceptions/ThemeLoaderException.php
@@ -6,9 +6,6 @@
 
 final class ThemeLoaderException extends \RuntimeException
 {
-    /**
-     * @return \Hexadog\ThemesManager\Exceptions\ThemeLoaderException
-     */
     public static function duplicate(string $name): self
     {
         return new self(sprintf(
diff --git a/src/Helpers/Json.php b/src/Helpers/Json.php
index 2871836..4c23be6 100644
--- a/src/Helpers/Json.php
+++ b/src/Helpers/Json.php
@@ -29,7 +29,7 @@ final class Json
     /**
      * The constructor.
      */
-    public function __construct(string $path, ?Filesystem $filesystem = null)
+    public function __construct(string $path, Filesystem $filesystem = null)
     {
         $this->path = $path;
         $this->filesystem = $filesystem ? $filesystem : new Filesystem();
@@ -103,7 +103,7 @@ public function setPath(string $path): Json
     /**
      * Make new instance.
      */
-    public static function make(string $path, ?Filesystem $filesystem = null): Json
+    public static function make(string $path, Filesystem $filesystem = null): Json
     {
         return new self($path, $filesystem);
     }
@@ -136,7 +136,7 @@ public function getAttributes(): array
     /**
      * Convert the given array data to pretty json.
      */
-    public function toJsonPretty(?array $data = null): false|string
+    public function toJsonPretty(array $data = null): false|string
     {
         return json_encode($data ? $data : $this->attributes, JSON_PRETTY_PRINT);
     }
diff --git a/src/Http/Middleware/ThemeLoader.php b/src/Http/Middleware/ThemeLoader.php
index edbaf1b..f2057f7 100644
--- a/src/Http/Middleware/ThemeLoader.php
+++ b/src/Http/Middleware/ThemeLoader.php
@@ -12,7 +12,7 @@ class ThemeLoader
     /**
      * Handle an incoming request.
      */
-    public function handle(Request $request, \Closure $next, ?string $theme = null)
+    public function handle(Request $request, \Closure $next, string $theme = null)
     {
         // Do not load theme if API request or App is running in console
         if ($request->expectsJson() || app()->runningInConsole()) {
diff --git a/src/Theme.php b/src/Theme.php
index f6a655f..a1075fc 100644
--- a/src/Theme.php
+++ b/src/Theme.php
@@ -88,7 +88,7 @@ public static function make(...$arguments): self
     /**
      * Get path.
      */
-    public function getPath(?string $path = null): string
+    public function getPath(string $path = null): string
     {
         return $this->path . $path;
     }
@@ -96,7 +96,7 @@ public function getPath(?string $path = null): string
     /**
      * Get assets path.
      */
-    public function getAssetsPath(?string $path = null): string
+    public function getAssetsPath(string $path = null): string
     {
         return Config::get('themes-manager.symlink_path', 'themes') . '/' . mb_strtolower($this->vendor) . '/' . mb_strtolower($this->name) . ($path ? '/' . $path : '');
     }
@@ -173,7 +173,7 @@ public function setPath(string $path): self
     /**
      * Set theme vendor.
      */
-    public function setVendor(?string $vendor = null): self
+    public function setVendor(string $vendor = null): self
     {
         if (Str::contains($vendor, '/')) {
             $this->vendor = dirname($vendor);
@@ -210,7 +210,7 @@ public function setParent(string|Theme|null $theme): self
     /**
      * Get parent Theme.
      */
-    public function getParent(): Theme|null
+    public function getParent(): ?Theme
     {
         if (is_string($this->parent)) {
             $this->parent = ThemesManager::findByName($this->parent);
diff --git a/src/ThemesManager.php b/src/ThemesManager.php
index c0bf487..0e12482 100644
--- a/src/ThemesManager.php
+++ b/src/ThemesManager.php
@@ -42,7 +42,7 @@ public function all(): Collection
     /**
      * Check if theme with given name exists.
      */
-    public function has(?string $name = null): bool
+    public function has(string $name = null): bool
     {
         return ! is_null($this->findByName($name, null));
     }
@@ -50,7 +50,7 @@ public function has(?string $name = null): bool
     /**
      * Get theme by name (or return all themes if no name given).
      */
-    public function get(?string $name = null): ?Theme
+    public function get(string $name = null): ?Theme
     {
         return $this->findByName($name, null);
     }
@@ -187,7 +187,7 @@ public function url(string $asset, bool $absolute = true): ?string
      * If no vendor provided and name not prefixed by vendor
      * the first theme with given name is returned.
      */
-    public function findByName(string $name, ?string $vendor = null): ?Theme
+    public function findByName(string $name, string $vendor = null): ?Theme
     {
         // normalize theme name
         $name = str_replace(['-theme', 'theme-'], '', $name);