diff --git a/stubs/ujson/ujson.pyi b/stubs/ujson/ujson.pyi
index b2528a9d0..9a8349668 100644
--- a/stubs/ujson/ujson.pyi
+++ b/stubs/ujson/ujson.pyi
@@ -1,3 +1,5 @@
+from _typeshed import Incomplete
+from collections.abc import Callable
 from typing import IO, Any, AnyStr
 
 __version__: str
@@ -10,6 +12,10 @@ def encode(
     escape_forward_slashes: bool = ...,
     sort_keys: bool = ...,
     indent: int = ...,
+    allow_nan: bool = ...,
+    reject_bytes: bool = ...,
+    default: Callable[[Incomplete], Incomplete] | None = None,
+    separators: tuple[str, str] | None = None,
 ) -> str: ...
 def dumps(
     obj: Any,
@@ -19,6 +25,10 @@ def dumps(
     escape_forward_slashes: bool = ...,
     sort_keys: bool = ...,
     indent: int = ...,
+    allow_nan: bool = ...,
+    reject_bytes: bool = ...,
+    default: Callable[[Incomplete], Incomplete] | None = None,
+    separators: tuple[str, str] | None = None,
 ) -> str: ...
 def dump(
     obj: Any,
@@ -29,6 +39,10 @@ def dump(
     escape_forward_slashes: bool = ...,
     sort_keys: bool = ...,
     indent: int = ...,
+    allow_nan: bool = ...,
+    reject_bytes: bool = ...,
+    default: Callable[[Incomplete], Incomplete] | None = None,
+    separators: tuple[str, str] | None = None,
 ) -> None: ...
 def decode(s: AnyStr, precise_float: bool = ...) -> Any: ...
 def loads(s: AnyStr, precise_float: bool = ...) -> Any: ...