diff --git a/pylacus/api.py b/pylacus/api.py
index 291c3c5..b30cd1c 100644
--- a/pylacus/api.py
+++ b/pylacus/api.py
@@ -64,7 +64,7 @@ class CaptureSettings(TypedDict, total=False):
     url: str | None
     document_name: str | None
     document: str | None
-    browser: str | None
+    browser: Literal['chromium', 'firefox', 'webkit'] | None
     device_name: str | None
     user_agent: str | None
     proxy: str | dict[str, str] | None