diff --git a/third_party/2and3/yaml/__init__.pyi b/third_party/2and3/yaml/__init__.pyi
index 4a221883d..12b834554 100644
--- a/third_party/2and3/yaml/__init__.pyi
+++ b/third_party/2and3/yaml/__init__.pyi
@@ -37,9 +37,9 @@ def serialize_all(nodes, stream: IO[str], Dumper=..., canonical=..., indent=...,
 def serialize_all(nodes, stream: None = ..., Dumper=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding: Optional[_Str] = ..., explicit_start=..., explicit_end=..., version=..., tags=...) -> _Yaml: ...
 
 @overload
-def serialize(node, stream: IO[str], Dumper=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding=..., explicit_start=..., explicit_end=..., version=..., tags=...) -> None: ...
+def serialize(node, stream: IO[str], Dumper=..., *, canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding=..., explicit_start=..., explicit_end=..., version=..., tags=...) -> None: ...
 @overload
-def serialize(node, stream: None = ..., Dumper=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding: Optional[_Str] = ..., explicit_start=..., explicit_end=..., version=..., tags=...) -> _Yaml: ...
+def serialize(node, stream: None = ..., Dumper=..., *, canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding: Optional[_Str] = ..., explicit_start=..., explicit_end=..., version=..., tags=...) -> _Yaml: ...
 
 @overload
 def dump_all(documents: Sequence[Any], stream: IO[str], Dumper=..., default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding=..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> None: ...
@@ -47,19 +47,19 @@ def dump_all(documents: Sequence[Any], stream: IO[str], Dumper=..., default_styl
 def dump_all(documents: Sequence[Any], stream: None = ..., Dumper=..., default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding: Optional[_Str] = ..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> _Yaml: ...
 
 @overload
-def dump(data: Any, stream: IO[str], Dumper=..., default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding=..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> None: ...
+def dump(data: Any, stream: IO[str], Dumper=..., *, default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding=..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> None: ...
 @overload
-def dump(data: Any, stream: None = ..., Dumper=..., default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding: Optional[_Str] = ..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> _Yaml: ...
+def dump(data: Any, stream: None = ..., Dumper=..., *, default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding: Optional[_Str] = ..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> _Yaml: ...
 
 @overload
-def safe_dump_all(documents: Sequence[Any], stream: IO[str], default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding=..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> None: ...
+def safe_dump_all(documents: Sequence[Any], stream: IO[str], *, default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding=..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> None: ...
 @overload
-def safe_dump_all(documents: Sequence[Any], stream: None = ..., default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding: Optional[_Str] = ..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> _Yaml: ...
+def safe_dump_all(documents: Sequence[Any], stream: None = ..., *, default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding: Optional[_Str] = ..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> _Yaml: ...
 
 @overload
-def safe_dump(data: Any, stream: IO[str], default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding=..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> None: ...
+def safe_dump(data: Any, stream: IO[str], *, default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding=..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> None: ...
 @overload
-def safe_dump(data: Any, stream: None = ..., default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding: Optional[_Str] = ..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> _Yaml: ...
+def safe_dump(data: Any, stream: None = ..., *, default_style=..., default_flow_style=..., canonical=..., indent=..., width=..., allow_unicode=..., line_break=..., encoding: Optional[_Str] = ..., explicit_start=..., explicit_end=..., version=..., tags=..., sort_keys: bool = ...) -> _Yaml: ...
 
 def add_implicit_resolver(tag, regexp, first=..., Loader=..., Dumper=...): ...
 def add_path_resolver(tag, path, kind=..., Loader=..., Dumper=...): ...