diff --git a/scrapling/engines/pw.py b/scrapling/engines/pw.py
index 6aa89ec..e49f622 100644
--- a/scrapling/engines/pw.py
+++ b/scrapling/engines/pw.py
@@ -27,11 +27,11 @@ class PlaywrightEngine:
             page_action: Callable = do_nothing,
             wait_selector: Optional[str] = None,
             wait_selector_state: Optional[str] = 'attached',
-            stealth: bool = False,
-            hide_canvas: bool = False,
-            disable_webgl: bool = False,
+            stealth: Optional[bool] = False,
+            hide_canvas: Optional[bool] = False,
+            disable_webgl: Optional[bool] = False,
             cdp_url: Optional[str] = None,
-            nstbrowser_mode: bool = False,
+            nstbrowser_mode: Optional[bool] = False,
             nstbrowser_config: Optional[Dict] = None,
             google_search: Optional[bool] = True,
             extra_headers: Optional[Dict[str, str]] = None,